Engineering Sciences Publishing

1.      The oxidization number of an atom that forms a covalent bond is equal to the number of_____________.

A.     Total  electron

B.      Given electron

C.      Receiving electron

D.     Shared electron

  ANS: D

 EXP: The oxidization number of an atom that forms a covalent bond is equal to the number of Shared electron

2.      Several common gases in their free states exist as diatomic molecule. Which is the most electronegative element?

A.     Hydrogen

B.     Fluorine

C.      Chlorine

D.    Nitrogen

  ANS: B

  EXP: the most electronegative element is fluorine.

3.        Generally the numbers are reduced to their lowest terms. What is the exception?

A.     FeCl₃

B.     H₂O

C.     FeCl₂

D.     H₂O₂

  ANS: D

  EXP: the exception is H₂O_2.

4.       The element name can be used with the oxidation number written in roman number. What is the correct name of FeCl₂

A.     Iron(II)

B.      Iron(III) chloride

C.     Ferrous chloride

D.    Ferric chloride

  ANS: C

  EXP: the correct name of FeCl₂ is ferrous chloride

5.      The number atoms of each element are specified by a special thing. What is that thing?

A.    Suffixes 

B.      Prefixes

C.      Power

D.     Multiplies

  ANS: B

 EXP: The number atoms of each element are specified by Prefixes

6.       An element and a radical with both them generally a special compound forms. What should be that compound?

A.    Mono  compound

B.     Binary compound

C.      Ternary compound

D.     Only compound

  ANS: C

  EXP: An element and a radical with both them Ternary compound forms.

7.       The symbol of chromate is CrO₄. What should be its charge number?

A.     +1

B.      -1

C.      +2

D.     -2

  ANS: D

  EXP: charge number of chromate is -2.

8.      The symbol of chromium is Cr. What should not be its charge number?

A.     +1

B.      +2

C.      +3

D.     +4

  ANS: A

  EXP: charge number of chromium +2, +3,and +6.

9.      The symbol of phosphorous is P. What should not be its charge number?

A.     -3

B.      +3

C.      -5

D.     +5

  ANS: C

  EXP: charge number of phosphorous is -3, +3, and +5.

10.   The charge number of permanganate is -1. What should be its symbol?

A.     MnO₄

B.      MnO₃

C.     MnO₂

D.    MnO

  ANS: A

  EXP: its symbol is MnO₄.

11.   The acid containing ne less oxygen atom than the root is given the ending “-ous”. What is the symbol of perchloric acid?

A.     HClO

B.      HClO₂

C.     HClO₃

D.    HClO ₄

  ANS: D

  EXP: the symbol of perchloric acid is HClO ₄

12.   A pure compound is always composed of the same elements combined in definite proportion by______________?

A.     Weight

B.      Mass

C.      Atom number

D.     Proton number.

  ANS: B

  EXP: A pure compound is always composed of the same elements combined in definite proportion by mass.

13.  A pure compound is always composed of the same elements combined in definite proportion by mass. Among the following which is invalid compound formula?

A.     MnO₄

B.      HClO₃

C.     FeCl₂

D.    NaCO₃

  ANS: D

  EXP: invalid compound formula is NaCO₃

14.   The three main types of moles are based on mass. Among the following which is the incorrect measuring unit?

A.     Grams

B.      Kilo grams

C.      Pounds

D.     Kilo pounds

  ANS: D

  EXP: The three main types of moles are based on mass measured in Grams, Kilo grams and Pounds.

15.   One gram mole of any substance has a number of particles. What is that number of particle?

A.     6.022*10²²

B.     6.022*10²³

C.     6.022*10²⁴

D.    6.022*10²⁵

  ANS: B

  EXP: One gram mole of any substance has a number of particles equal to6.022*10²⁵

16.   The molecular weight is the sum of atomic weights of all atoms in the molecules.  Among the following which is same as this?

A.     Formula weight.

B.      Equivalent weight.

C.      Normal weight

D.     Atomic weight

  ANS: A

  EXP: The molecular weight is the sum of atomic weights of all atoms in the molecules which is same as Formula weight

17.  Molecular weight is usually denoted by MW.  Among the following which is the incorrect units?

A.    g/mol

B.      Kg/mol

C.      Kg/K mol

D.     lb/lb mol

  ANS: B

  EXP: The unit of Molecular weight is kg/k mol, lb/lb mol and g/mol

18.  For acid base reaction an acid  equivalent supplies one gram mole of ____________ions 

A.     H⁺

B.      H^-

C.      OH^-

D.    OH ⁺

  ANS: A

   EXP: For acid base reaction an acid equivalent supplies one gram mole of H⁺ ions 

19.    In oxidation reduction reaction an equivalent of a substance gains or loss something. Among the following which is gains or loss  In oxidation reduction reaction?

A.    Nucleus

B.     Neutron

C.     Electron 

D.     Proton

  ANS: C

  EXP: In oxidation reduction reaction an equivalent of a substance gains or loss Electron 

20.   The gravimetric fraction is found from a gravimetric analysis. What is the other name of this gravimetric analysis?

A.     Primary analysis

B.      Secondary analysis

C.      Normally analysis

D.     Ultimate analysis

  ANS: D

  EXP: The gravimetric fraction is found from a gravimetric analysis. the other name of this gravimetric analysis is Ultimate analysis.

21.   If the gravimetric fraction is known for all elements in a compound the combining weights of each element can be calculated. Among the following formula which is used for calculating the combining weights of each element?

A.     EW=MW /change of oxidation number.

B.     X_i  =m_i / (n₁+n₂+n₃+………. n_n )

C.      X_i =m_i / (m₁+m₂+m₃+…………m_n)

D.     %m_{i =} x_i  * 100%

  ANS: C

  EXP: If the gravimetric fraction is known for all elements in a compound the combining weights of each element can be calculated by X_i =m_i / (m₁+m₂+m₃+…………m_n).

22.   It is relatively simple to determine the empirical formula of a compound. From where can the empirical formula of a compound be determined?

A.     Atomic and combining weights

B.      Molecular and combining weights

C.      Equivalent weight and Molecular weights

D.     Equivalent weight and combining weights

  ANS: A

  EXP: It is relatively simple to determine the empirical formula of a compound From Atomic and combining weights

23.     Most elements exist in different form known as isotopes. What is the difference of different isotopes?

A.     In the number of neutrons

B.     In the number of Protons

C.     In the number of Electron

D.    In the number of Atom

  ANS: A

  EXP: Most elements exist in different form known as isotopes differing in the number of neutrons

24.   Hydrogen has three isotopes. Among the following which is not the isotopes of Hydrogen?

A.     H-1

B.      H-2

C.      H-3

D.     H-4

  ANS: D

  EXP: Hydrogen has three isotopes H-1, H-2and H-3

25.  Some isotopes are unstable and will disintegrate spontaneously. What is the name of this process?

A.     Nuclear reaction

B.      Atomic reaction

C.      Radioactive decay

D.     β decay.

  ANS: C

  EXP: Some isotopes are unstable and will disintegrate spontaneously and is known as Radioactive decay.

26.  Some isotopes are unstable and will disintegrate spontaneously and is known as Radioactive decay. What is the reason of instability?

A.     Too many neutron

B.      Too many proton

C.      Too many electron

D.     Too few proton

  ANS: A

  EXP: Some isotopes are unstable and will disintegrate spontaneously and is known as Radioactive decay the reason of instability are Too many neutron and too few neutrons.

27.  If a nucleus has too many neutrons a neutron may spontaneously transfer. To where the neutron is transferred?

A.     electron

B.      Stable neutron.

C.      proton

D.     Radioactive electron

  ANS: C

  EXP: If a nucleus has too many neutrons a neutron may spontaneously transfer into proton.

28.  If a nucleus has too many neutrons, a neutron may spontaneously transfer into proton. What is the name of this electron emission?

A.    -β  decay

B.     + µ decay

C.     -α decay

D.    +β decay

  ANS: A

  EXP: If a nucleus has too many neutrons a neutron may spontaneously transfer into proton this electron emission is known as -β decay

29.  If a nucleus has too few neutrons, a proton may spontaneously transfer into neutrons.  With what this transfer occur?

A.     Electron emission

B.      Neutron emission

C.     Positron emission

D.     Atomic emission

  ANS: C

  EXP: If a nucleus has too few neutrons, a proton may spontaneously transfer into neutrons with Positron emission

30.  If a nucleus has too few neutrons, a proton may spontaneously transfer into neutrons with Positron emission. . What is the name of this emission?

A.    -β  decay

B.     + µ decay

C.     -α decay

D.    +β decay

  ANS: D

  EXP: If a nucleus has too few neutrons, a proton may spontaneously transfer into neutrons with Positron emission. This emission is known as +β decay.

31.   α Decay decreases the number of both protons and neutrons. What is the amount of decreasing?

A.     By two

B.      By three

C.      By four

D.     By five

  ANS: A

  EXP: α Decay decreases the number of both protons and neutrons by two.

32.  α Decay decreases the number of both protons and neutrons by two. What is the result of this decreasing?

A.    Stable Neutron

B.     Stable proton

C.      Stable nucleus.

D.     Stable electron

  ANS: C

  EXP: α Decay decreases the number of both protons and neutrons by two and may also result in a Stable nucleus.

33.   The disintegration of radioactive isotopes is described by a special law. What is that law?

A.     Negative power law

B.      Positive  power law

C.     Positive  exponential law

D.     Negative exponential law

  ANS: D

  EXP: The disintegration of radioactive isotopes is described by negative exponential law

34.   The behavior of a substance whose quantity changes at a rate proportional to the quantity present. Which law describes this theory?

A.     Negative power law

B.      Positive  power law

C.     Positive  exponential law

D.     Negative exponential law 

  ANS: D

  EXP: Negative exponential law describes the behavior of a substance whose quantity changes at a rate proportional to the quantity present

35.    The rate of radioactive Decay is essentially independent of the local environment. What is the specification of the rate of radioactive Decay?

A.     t_1/2

B.      t_1/3

C.      t^1/2

D.     t^1/3

  ANS: A

  EXP: The rate of radioactive Decay is essentially independent of the local environment and is specified by t_1/2

36.  The rate of radioactive Decay is essentially independent of the local environment. What is meant by local environment?

A.     Air

B.     Pressure

C.      Water

D.     Isolated state

  ANS: B

  EXP: The rate of radioactive Decay is essentially independent of the local environment (Pressure, temperature).

37.   The number of atoms left at time t can be calculated by Negative exponential law. Among the following which is the correct equation?

A.     N = N₀e^{-0.6938t /} t_1/2

B.     N = N₀e^{-0.6938 t}_1/2 ^/t

C.     N = N₀e^{-0.5938t /} t_1/2

D.    N = N₀e^{-0.4938t / t}_1/2

  ANS: A

  EXP: The number of atoms left at time t can be calculated by equation N = N₀e^{-0.6938t /} t_1/2

38.   During chemical reaction bonds between atoms are broken and new bonds are formed. What is the name of starting substance?

A.     Pollutants

B.      Solvent

C.      Product

D.     Reactant

  ANS: D

  EXP: During chemical reaction bonds between atoms are broken and new bonds are formed the name of starting substance is Reactant

39.  During chemical reaction bonds between atoms are broken and new bonds are formed. What is the name of ending substance?

A.     Pollutants

B.      Solvent

C.      Product

D.     Reactant

  ANS: C

  EXP: During chemical reaction bonds between atoms are broken and new bonds are formed the name of ending substance is Reactant.

40.   Equal numbers of molecule in the gas phase occupy equal volume at the same condition. Who has explained this hypothesis?

A.    Avogadro 

B.      Newton

C.      Einstein 

D.     Galileo

  ANS: A

  EXP: Equal numbers of molecule in the gas phase occupy equal volume at the same condition. This is result of Avogadro’s hypothesis.

41.    Oxidation reduction reaction involves the transfer of electron from one element to another. What is the other name of this Oxidation reduction reaction?

A.     Chemical reaction

B.      Ionization reaction

C.      Redox reaction

D.    Thermal   reaction

  ANS: C

  EXP: the other name of this Oxidation reduction reaction is Redox reaction.

42.  In oxidation the substance oxidation state increases. What happened when the substance oxidation state increases?

A.     Loses protons

B.     Gains  protons

C.     Gains  electrons

D.    Loses electrons

  ANS: D

  EXP: In oxidation the substance oxidation states increases and the substance Loses electrons.

43.  In reduction the substance oxidation state decreases. What happened when the substance oxidation state decreases?

A.     Loses protons

B.     Gains  protons

C.     Gains  electrons

D.    Loses electrons

  ANS: C

  EXP: In reduction the substance oxidation state decreases and the substance Gains electrons

44.  In reduction the substance oxidation states decreases and the substance Gains electrons. Where the reductions occur?

A.     At the cathode

B.      At the anode

C.      At the positive terminal

D.     At the solution

  ANS: A

  EXP: In reduction the substance oxidation states decreases and the substance Gains electrons the reductions occur at the cathode.

45.  In oxidation the substance oxidation state increases and the substance Loses electrons

            Where the oxidations occur?

A.     At the cathode.

B.      At the anode.

C.      At the negative terminal.

D.     At the solution.

  ANS: B

  EXP: In oxidation the substance oxidation states increases and the substance loses electrons the oxidation occurs at the anode.

46.   The substance that causes oxidation to occur is called the oxidizing agent and is itself reduced in the process. What is the position after the oxidation of the oxidizing agent?

A.     It becomes less positive

B.      It becomes more positive

C.      It becomes less negative

D.    It becomes more negative

  ANS: D

  EXP: The substance that causes oxidation to occur is called the oxidizing agent and is itself reduced in the process and becomes more negative.

47.  The substance that causes reduction to occur is called the reducing agent and is itself oxidize in the process. What is the position after the reduction of the reducing agent?

A.     It becomes less positive

B.      It becomes more positive

C.      It becomes less negative

D.    It becomes more negative

  ANS: C

  EXP: The substance that causes reduction to occur is called the reducing agent and is itself oxidize in the process and becomes less negative.

48.  Reversible reaction is capable of going in either direction and does so to varying degrees simultaneously. Among the following which is the depending factor?

A.    Temperature 

B.      Pressure

C.      Mass

D.     Weight

  ANS: A

  EXP: Reversible reaction is capable of going in either direction and does so to varying degrees simultaneously depending on temperature and concentration.

49.  Reversible reaction is capable of going in either direction and does so to varying degrees simultaneously depending on temperature. What is the other depending factor?

A.     Pressure

B.      Mass

C.      Weight

D.    concentration

  ANS: D

  EXP: Reversible reaction is capable of going in either direction and does so to varying degrees simultaneously depending on temperature and concentration.

50.   Reversible reactions are characterized by the simultaneous presence of all reactants and products. Among the following which one is the chemicals equation of the formation of ammonia?

A.    N₂ +3H₂=2NH₃

B.     N₂ +2H₂=3NH₃ +HEAT

C.      N₂ +3H₂=2NH₃ +HEAT

D.     N₂ +2H₂=3NH₃

  ANS: C

        EXP: the chemicals equation of the formation of ammonia is N₂ +3H₂=2NH₃ +HEAT

51.   When an equilibrium state is stressed by a change, a new equilibrium that reduces that stress is reached. What is the name of this principle?

A.     Avogadro principle.

B.      Newton principle.

C.      Einstein principle.

D.    Le Chatelier’s principle.

  ANS: D

  EXP: Le Chatelier’s principle state that when an equilibrium state is stressed by a change, a new equilibrium that reduces that stress is reached.

52.  Le Chatelier’s principle state that when an equilibrium state is stressed by a change, a new equilibrium that reduces that stress is reached. Among the following which is one is not the condition for this principal?

A.    Pressure 

B.      Temperature

C.      Environment

D.     Concentration

  ANS: C

 EXP: Le Chatelier’s principle states that when an equilibrium state is stressed by a change, a new equilibrium that reduces that stress is reached the condition are Pressure, Temperature and Concentration.

53.   For reactions that involve gases, the reaction equation coefficient can be interpreted as a special factor. What is the name of this factor?

A.     Volumes

B.      Masses

C.      Weights

D.     Atomic number

  ANS: A

  EXP: For reactions that involve gases, the reaction equation coefficient can be interpreted as Volumes.

54.  In the nitrogen hydrogen reaction four volumes combine to form two volumes. If the equilibrium system is stressed by increasing the pressure then the forward reactions will occur. What is the reason of doing so?

A.     The direction reduces the temperature and pressure

B.     The direction increases the temperature and pressure

C.     The direction reduces the volume and pressure 

D.    The direction increases the volume and pressure

  ANS: C

  EXP: In the nitrogen hydrogen reaction four volumes combine to form two volumes. If the equilibrium system is stressed by increasing the pressure then the forward reactions will occur because the direction reduces the volume and pressure 

55.   The time required for a reaction to proceed to equilibrium or completion depends on the rate of reaction. What is the rate of reaction?

A.     Change in concentration per unit time

B.      Change in volume per unit time

C.      Change in temperature per unit time

D.    Change in pressure per unit time

  ANS: A

  EXP: The time required for a reaction to proceed to equilibrium or completion depends on the rate of reaction. the rate of reaction r is the Change in concentration per unit time

56.  The time required for a reaction to proceed to equilibrium or completion depends on the rate of reaction. The rate of reaction r is the Change in concentration per unit time. What is the unit of the rate of reaction?

A.     Moles/L

B.      Moles-s/L

C.      Moles /L-s

D.     Ls/moles

  ANS: C

  EXP: The time required for a reaction to proceed to equilibrium or completion depends on the rate of reaction. The rate of reaction r is the Change in concentration per unit time. What is the unit of the rate of reaction measured in Moles /L-s.

57.   The speed of reaction is proportional to the equilibrium molar concentration.  Under the following which law states this?

A.     Positive  exponential law

B.      Negative exponential law 

C.     Avogadro law

D.     Mass action law

  ANS: D

             EXP:  According to the law of mass action, the speed of reaction is proportional to the equilibrium molar concentration.

58.    According to the law of mass action, the speed of reaction is proportional to the equilibrium molar concentration. At a position the forward and backward speed of reaction are equal. Where should be the forward and backward speed of reaction are equal?

A.    At the equilibrium

B.       At the starting of reaction

C.      At the ending of reaction

D.     At the middle of the reaction.

  ANS: A

  EXP:  According to the law of mass action, the speed of reaction is proportional to the equilibrium molar concentration. At the equilibrium the forward and backward speed of reaction are equal

59.  At the equilibrium the forward and backward speed of reaction are equal. The rate of reaction for solution is not affected by a factor. What should be that factor?

A.    Catalyst

B.      Concentration

C.     Pressure 

D.     Temperature

  ANS: C

  EXP: At the equilibrium the forward and backward speed of reaction are equal. The rate of reaction for solution is not affected by pressure

60.  At the equilibrium the forward and backward speed of reaction are equal. The rate of reaction for solution is affected by Temperature, Concentration, Catalyst etc. what does it happened when solution affected by Temperature?

A.    Reaction increases with increase of temperature

B.      Reaction decreases with increase of temperature

C.     Reaction increases with decreases of temperature

D.    Reaction decreases with decreases of temperature

  ANS: A

  EXP: At the equilibrium the forward and backward speed of reaction are equal. The rate of reaction for solution is affected by Temperature, Concentration, Catalyst etc. Reaction increases with increase of temperature

61.  At the equilibrium the forward and backward speed of reaction are equal. The rate of reaction for solution is affected by Temperature, Concentration, Catalyst etc. what does it happened when solution affected by concentration?

A.     Reaction increases with decreases of concentration

B.     Reaction decreases with decreases of concentration

C.     Reaction increases with increase of concentration

D.     Reaction decreases with increase of concentration

  ANS: C

  EXP: At the equilibrium the forward and backward speed of reaction are equal. The rate of reaction for solution is affected by Temperature, Concentration, Catalyst etc. Reaction increases with increase of concentration.

62.   A catalyst is a substance that increases the reaction rate without being consumed in the reaction. Among the following which one will happen if catalyst is introduced?

A.     Rate of reaction will increase

B.      Rate of reaction will decrease

C.      Equilibrium will reach more quickly

D.     Equilibrium will not change

  ANS: B

  EXP: A catalyst is a substance that increases the reaction rate without being consumed in the reaction if catalyst is introduced Rate of reaction will not decrease

63.   The total number of reacting molecule in or before the slowest step in the mechanism, as determined experimentally. Among the following which one will state this?

A.     The forward reaction

B.      The reversible reaction

C.     The rate of a reaction

D.    The order of a reaction

  ANS: D

             EXP: The order of a reaction is defined as the total number of reacting molecule in or before the slowest step in the mechanism, as determined experimentally

64.  The order of a reaction is defined as the total number of reacting molecule in or before the slowest step in the mechanism, as determined experimentally. one reversible reaction is

aA+ bB  ↔  cC + dD. What should be the order of the forward reaction?

A.    a + b

B.      a + c

C.      b + c

D.     c + d

  ANS: A

            EXP: the order of the forward reaction is a + b

65.  The order of a reaction is defined as the total number of reacting molecule in or before the slowest step in the mechanism, as determined experimentally. one reversible reaction is

aA+ bB  ↔  cC + dD. What should be the order of the backward reaction?

A.     a + b

B.      a + c

C.      b + c

D.     c + d

  ANS: D

  EXP: the order of the backward reaction is c + d

66.   An ideal gas obeys ideal gas law. Among the following what should be the equation for determining the density of ideal gas?

A.     ρ T =R/P

B.     ρ  T =P/R

C.      ρ P =R/T

D.    ρ R =T/P

  ANS: B

  EXP: An ideal gas obeys ideal gas. Law the equation for determining the density of ideal gas ρ   =P / (TR)

67.  Avogadro’s hypothesis states that equal volume of all gases at the same temperature and pressure contains equal number of gas molecules. Specifically at standard scientific condition. What is the standard scientific condition?

A.     2 atm and 0⁰ C

B.      1 atm and 1⁰ C

C.      1 atm and 0⁰ C

D.     1 atm and 0⁰ K

  ANS: C

  EXP: Avogadro’s hypothesis states that equal volume of all gases at the same temperature and pressure contains equal number of gas molecules. Specifically at standard scientific condition which is 1 atm and 0⁰ C

68.  : Avogadro’s hypothesis states that equal volume of all gases at the same temperature and pressure contains equal number of gas molecules. Specifically at standard scientific condition which is 1 atm and 0⁰ C. what is the value of universal gas constant?

A.    .08205 atm L / mol K

B.     .08205 atm K / mol L

C.     .08206 atm L / mol K

D.     .08205 atm mol / L* K

  ANS: C

  EXP: the value of universal gas constant is  .08206 atm L / mol K

69.  The value of universal gas constant is  .08206. What should be the value of universal gas constant?

A.      atm L / mol K

B.       atm K / mol L

C.      J / mol K

D.      atm mol / L* K

  ANS: A

  EXP: Avogadro’s hypothesis states that equal volume of all gases at the same temperature and pressure contains equal number of gas molecules and value of universal gas constant is  .08206 atm L / mol K.

70.   An acid is any compound that dissociates in water into H⁺ ions. What is the name of this theory?

A.    Avogadro theory.

B.      Arrhenius theory.

C.      Einstein theory.

D.    Le Chatelier’s theory.

  ANS: B

  EXP: An acid is any compound that dissociates in water into H⁺ ions. This is known as Arrhenius theory.

71.  An acid is any compound that dissociates in water into H⁺ ions. This is known as Arrhenius theory. What should be the symbol of hydronium ion?

A.     H₃O⁺

B.      H₃O^-

C.     H₂O⁺

D.    H₂O^-

  ANS: A

  EXP: An acid is any compound that dissociates in water into H⁺ ions. This is known as Arrhenius theory. The symbol of hydronium ion is H₃O⁺

72.  An acid is any compound that dissociates in water into H⁺ ions. This is known as Arrhenius theory. Among the following which should not be the property of acid?

A.     Acid conducts electricity in aqueous solution

B.      Acids have a sour taste

C.      Acids turns red litmus paper blue

D.     Acids neutralize base.

  ANS: C

  EXP: Acids turns blue litmus paper red.

73.  A base is any compound that dissociates in water into OH^- ions. This is known as Arrhenius theory. Among the following which should not be the property of base?

A.     Base have a bitter taste

B.      Base have a pH between 7 and14

C.      Base neutralize acids

D.     Base turns blue litmus paper red

  ANS: D

  EXP: Base turns red litmus paper blue

74.   Organic chemistry deals with the formation and reaction of compounds of carbon. Among the following which should not be the characteristic of Organic chemistry?

A.     Relatively soluble in water.

B.      Relatively insoluble in water.

C.      Are soluble in organic solvent

D.     Are relatively nonionizing.

  ANS: A

  EXP:  they relatively insoluble in water but not relatively soluble in water

75.   The standard symbol of alkoxy is [RO].  Among the following what is the formula of alkoxy?

A.     C_n H_2n+2 O

B.     C_n H_n+1 O

C.     C_n H_2n+1 O

D.    C_n H_n+2 O

  ANS: C

  EXP: The standard symbol of alkoxy is [RO]; the formula of alkoxy is C_n H_2n+1 O

76.  The structure of fatty acid is [Ar]-[R]-OH.  Which of the following is the formula of benzoic acid?

A.     C₃ H₄ COOH

B.      C₄ H₅ COOH

C.     C₅ H₆ COOH

D.    C₆ H₅ COOH

  ANS: D

   EXP: the formula of benzoic acid is C₆ H₅ COOH

77.  The structure of carbohydrates sugar is C_x (H₂ O) _y. Which of the following is the formula of dextrose?

A.     C₆ H₁₂ O₅

B.     C₆ H₁₂ O₆

C.      C₁₂ H₆ O₆

D.     C₅ H₁₂ O₆

  ANS: B

  EXP: the formula of dextrose is C₆ H₁₂ O₆

78.  The structure of phenol is [Ar]-OH. Which of the following is the formula of phenol?

A.     C₆ H₅ OH

B.      C₅ H₆ OH

C.     C₆ H₅ OH₂

D.    C₅ H₆ OH₂

  ANS: A

  EXP: the formula of phenol is C₆ H₅ OH

79.   There are many units of concentration to express solution strength. Which of the following is not the unit?

A.     F -­­ formality

B.      M-molality

C.      N - normality

D.     x-mole fraction

  ANS: B

A.      EXP: There are many units of concentration to express solution strength. M-molality is not the unit.

80.   The amount of a slight soluble gas dissolved in a liquid is proportional to the partial pressure of gas as long as the gas and liquid are nonreacting. Which of the following is the law

A.     Arrhenius law

B.      Einstein law

C.     Le Chatelier’s law

D.    Henry’s  law

  ANS: D

  EXP: Henry’s law states that the amount of a slight soluble gas dissolved in a liquid is proportional to the partial pressure of gas as long as the gas and liquid are nonreacting

81.  Henry’s law states that the amount of a slight soluble gas dissolved in a liquid is proportional to the partial pressure of gas as long as the gas and liquid are nonreacting. Which of the following is the algebraic form of Henry’s law?

A.     P_i = h_i x

B.      P = h_i x_i

C.     P_i = h x_i

D.    P_i x = h_i

  ANS: C

  EXP: Henry’s law states that the amount of a slight soluble gas dissolved in a liquid is proportional to the partial pressure of gas as long as the gas and liquid are nonreacting. The algebraic form of Henry’s law is P_i = h x_i

82.  Henry’s law states that the amount of a slight soluble gas dissolved in a liquid is proportional to the partial pressure of gas as long as the gas and liquid are nonreacting.

The algebraic form of Henry’s law is P_i = h x_i .What is the name of h in the algebraic form of Henry’s law?

A.     only constant in atmosphere

B.     Law constant in atmosphere

C.      Law constant in pressure

D.     Law constant in temperature

  ANS: B

  EXP: the name of h in the algebraic form of Henry’s law is Law constant in atmosphere

83.   Sometimes the solute particles are larger than molecules. What is the name of this kind of mixture?

A.     hydration

B.      precipitation

C.      suspension

D.     saturation

  ANS: C

  EXP:   if the solute particles are larger than molecules, this mixture is known as suspension

84.   Adding more solute t an already saturated solution will cause the excess solute to settle to the bottom of the container. Which of the following process is this type?

A.    hydration

B.      precipitation

C.      suspension

D.     saturation

  ANS: B

  EXP: Adding more solute t an already saturated solution will cause the excess solute to settle to the bottom of the container. This process is known as precipitation

85.   When the product of terms exceeds the standard value of the solubility product soluble will __________________out.

A.    precipitate

B.      saturated

C.      suspended

D.     hydrated

  ANS: A

  EXP: When the product of terms exceeds the standard value of the solubility product soluble will precipitate out.

86.  When the product of terms exceeds the standard value of the solubility product soluble will precipitate out. Until the product of remaining ion concentration attain a certain value. Which of the following is the correct value?

A.     precipitate value

B.     suspended value

C.      Saturated value

D.    Standard value

  ANS: D

  EXP: When the product of terms exceeds the standard value of the solubility product soluble will precipitate out. Until the product of remaining ion concentration attain the Standard value

87.  When the product of terms exceeds the standard value of the solubility product soluble will precipitate out. Until the product of remaining ion concentration attain the Standard value. What will happen if the product is less than the standard value?

A.     The solution is saturated

B.      The solution is not saturated

C.      The solution is precipitate

D.     The solution is not precipitate

  ANS: B

  EXP: When the product of terms exceeds the standard value of the solubility product soluble will precipitate out. Until the product of remaining ion concentration attain the Standard value. If the product is less than the standard value, the solution is not saturated

88.   The solubility products of nonhydrolyzing compounds are relatively easy to calculate. Which of the following doesn’t encompass?

A.     Halides

B.      Iodates

C.      Sulfates

D.     Phosphates

  ANS: D

  EXP: solubility products of nonhydrolyzing compounds are relatively easy to calculate. This encompasses Sulfates, iodates, Halides chromates.

89.   The enthalpy of formation is assigned a value of zero for elements in their free state. Which of the following is the standard state for enthalpies of formation?

A.     0⁰C and 1 atm

B.      25⁰C and 2 atm

C.      25⁰C and 1 atm

D.     10⁰C and 1 atm

  ANS: C

  EXP: enthalpy of formation is assigned a value of zero for elements in their free state at 25⁰C and 1 atm

90.  The enthalpy of reaction is the energy absorbed during a chemical reaction. What is the condition for energy absorbed?

A.    Constant volume condition

B.      Variable  volume condition

C.     Constant pressure condition

D.    Variable  volume condition

  ANS: A

  EXP: The enthalpy of reaction is the energy absorbed during a chemical reaction under Constant volume condition

91.   Hess’ law of energy summation is essentially a restatement of the energy conservation principle. Which of the following is the Hess’ formula?

A.    ∆ H_f  =∑∆ H_f,products  -  ∑∆ H_f,reactants

B.      ∆ H_r  =∑∆ H_r,products  -  ∑∆ H_f,reactants

C.     ∆ H_r  =∑∆ H_f,products  -  ∑∆ H_f,reactants

D.    ∆ H_r  =∑∆ H_{f, reactants}  -  ∑∆ H_{f, products}

  ANS: C

  EXP: Hess’ law of energy summation is essentially a restatement of the energy conservation principle. The Hess’ formula is∆ H_r =∑∆ H_{f, products} - ∑∆ H_{f, reactants}

92.  Hess’ law of energy summation is essentially a restatement of the energy conservation principle. What should be the name of the reaction if energy is given off?

A.     Endothermic reaction

B.      Exothermic reaction

C.      Nuclear reaction

D.     Unsaturated reaction

  ANS: B

  EXP: Hess’ law of energy summation is essentially a restatement of the energy conservation principle. Reactions that give off energy is called exothermic reaction.

93.   The heat of solution is an amount of energy that is absorbed or released when a substance enters a solution. Which of the following is the amount heat produced in the formation of dilute hydrochloric acid?

A. 17.21 kcal / mol

B. -17.21 kcal /k mol

C. 17.21 kcal / k mol

D. -17.21 kcal / mol

ANS: D

EXP: The heat of solution is an amount of energy that is absorbed or released when a substance enters a solution the amount heat produced in the formation of dilute hydrochloric acid is  -17.21 kcal / mol

94.  A liquid is boils when its vapor pressure is equal to the surrounding pressure. Because the addition of a salute to solvent decrease the vapor pressure. Among of the following which law supports this?

             A. Arrhenius law

B. Raoult’s law

C. Le Chatelier’s law

D. Henry’s law

      ANS: D

EXP: A liquid is boils when its vapor pressure is equal to the surrounding pressure. Because the addition of a salute to solvent decrease the vapor pressure (. Raoult’s law)

95.  A liquid is boils when its vapor pressure is equal to the surrounding pressure. Because the addition of a salute to solvent decrease the vapor pressure. What is the molal boiling point constant for water?

             A. 0.511⁰ C/m

B. 0.512⁰ C/m

C. 1.806⁰ C/m

  D. 1.860⁰ C/m

        ANS: B

  EXP: A liquid is boils when its vapor pressure is equal to the surrounding pressure. Because the addition of a salute to solvent decrease the vapor pressure the molal boiling point constant for water is 0.512⁰ C/m.

96.  Specific energy is denoted by E. which of the following is the unit of specific energy?

A.    ft-lb f / lb cm

B.      ft-lb f / lb m

C.     ft-lb / lb cm

D.    ft-lb f /  cm

  ANS: B

  EXP: The unit of specific energy is ft-lb f / lb m

97.  Gravitational constant is denoted by g_c. _. Which of the following is the unit of Gravitational constant?

A.     ft-lb f / lb m

B.      lb m-ft/lb-sec²

C.      lb m-ft/lb f-sec

D.    lb m-ft/lbf-sec²

  ANS: D

  EXP: The unit of Gravitational constant is lb m-ft/lbf-sec²

98.  Hydraulic grade is denoted by S. Which of the following is the unit of Hydraulic grade?

A.     ft/ft

B.      lb/lb

C.     ft/sec

D.     lb/sec

  ANS: A

  EXP: The unit of Hydraulic grade is ft/ft

99.   The symbol of absolute viscosity is μ. Which of the following is the unit of absolute viscosity?

A.    Lb -sec/ft²

B.     lb f-sec/ft

C.     lb f-sec/ft²

D.     lb² f-sec/ft²

  ANS: C

  EXP: the unit of absolute viscosity is lb f-sec/ft²

100.           Fluid mass is always conserved in fluid system. Among the following which doesn’t support the conservation of mass?

A.     Pipeline simplicity

B.     Pipeline complexity

C.      Orientation of fluid flow

D.     Type of fluid flowing.

  ANS: A

  EXP: Fluid mass is always conserved in fluid system regardless of the Pipeline complexity orientation of fluid flow or type of fluid flowing.

101.          Fluid mass is always conserved in fluid system regardless of the Pipeline complexity orientation of fluid flow or type of fluid flowing. This single concept is often sufficient to solve simple fluid problem m_{1 =} m₂. What would be the name of conservation of mass law when applied to fluid flow?

A.     Energy equation

B.      Bernoulli’s  equation

C.     Continuity   equation

D.    Bounty force  equation

  ANS: C

  EXP: Fluid mass is always conserved in fluid system regardless of the Pipeline complexity orientation of fluid flow or type of fluid flowing. This single concept is often sufficient to solve simple fluid problem m_{1 =} m₂. When applied to fluid flow the conservation of mass law   is known as Continuity   equation

102.           The continuity equation states that the flow passing any two points in a system is the same. which of the following is not the form of this equation?

A.    m° = ρ A v

B.     m° = ρ A m

C.      m° = ρ Q

D.     ρ ₁ A₁ v₁ = ρ ₂ A₂ v₂

  ANS: B

  EXP: The continuity equation states that the flow passing any two points in a system is the same. The form of this equation  m° = ρ A v; m° = ρ Q; ρ ₁ A₁ v₁ = ρ ₂ A₂ v₂

103.          The continuity equation states that the flow passing any two points in a system is the same. What will be the form if the fluid is incompressible?

A.     ρ ₁ =  ρ ₂

B.      Q = A v

C.      A₁ v₁ = A₂ v₂

D.    ρ  =  A v

  ANS: D

  EXP: The continuity equation states that the flow passing any two points in a system is the same if the fluid is incompressible then the form will be ρ ₁ =  ρ _2; Q =  A₁ v₁ = A₂ v₂

104.           When a substance is compressed work is performed. What will be the other effect after a substance is compressed?

A.     Energy is conserved

B.     Energy is expanded

C.      Pressure is expanded

D.     Pressure is conserved

  ANS: B

  EXP: When a substance is compressed work is performed and Energy is expanded

105.          When a substance is compressed work is performed and Energy is expanded. Thus a mass of fluid at high pressure will have more energy than an identical mass of fluid at a lower pressure. What is the name of this energy?

A.     Pressure energy of the fluid

B.      Conserved energy of the fluid

C.      Volume energy of the fluid

D.     Extra energy of the fluid

  ANS: A

  EXP: When a substance is compressed work is performed and Energy is expanded. Thus a mass of fluid at high pressure will have more energy than an identical mass of fluid at a lower pressure. This energy is the pressure energy of the fluid

106.            Pressure head is denoted by h_p. which of the following is not the equation of pressure head?

A.     h_p = E_P /g

B.     h_p = E_P* g_c /g

C.     h_p = p/γ

D.    h_p =  ρ* g_c /pg

  ANS: D

  EXP: Pressure head is denoted by h_p. the equation of pressure head is h_p = E_P /g ;                                 h_p = E_P* g_c/g ; h_p = p/γ

107.           Energy is required to accelerate a stationary body. Thus a moving mass of fluid possess more energy than an identical stationary mass. What is the name of this energy?

A.     Pressure energy

B.      Potential energy

C.     Kinetic energy 

D.     Reserved energy

  ANS: C

  EXP: Energy is required to accelerate a stationary body. Thus a moving mass of fluid possess more energy than an identical stationary mass. This energy is known as Kinetic energy 

108.          Energy is required to accelerate a stationary body. Thus a moving mass of fluid possess more energy than an identical stationary mass. This energy is known as Kinetic energy. what will be the name if the energy is evaluate per unit second ?

A.    Relative   Kinetic energy

B.     Specific  Kinetic energy

C.     Resultant  Kinetic energy

D.    Preserved  Kinetic energy

  ANS: B

  EXP: Energy is required to accelerate a stationary body. Thus a moving mass of fluid possess more energy than an identical stationary mass. This energy is known as Kinetic energy if the energy is evaluate per unit second the term Specific  Kinetic energy is used.

109.          Energy is required to accelerate a stationary body. Thus a moving mass of fluid possess more energy than an identical stationary mass. This energy is known as Kinetic energy if the energy is evaluate per unit second the term Specific  Kinetic energy is used. Which of the following is the equation for Specific Kinetic energy?

A.    E_{v =} v² /2

B.      E_v = v² /3

C.      E_v = v² /g_c

D.    E_v  = v² /3* g_c

  ANS: A

  EXP: the equation for Specific Kinetic energy is E_{v =} v² /2

110.          If the energy is evaluate per unit second the term Specific Kinetic energy is used. Why Specific Kinetic energy is used?

A.     For calculating pressure  head

B.      For calculating total velocity

C.      For calculating total energy

D.     For calculating velocity head

  ANS: D

  EXP: Specific Kinetic energy is used for calculating velocity head

111.          Specific Kinetic energy is used for calculating velocity head. Which of the following is not the equation of velocity head?

A.     h_{v =} v² /2* g_c

B.     h_{v =} v² /2* g

C.     h_{v =} E_v  /g

D.    h_{v =} E_v * g_c /g

  ANS: A

  EXP: Specific Kinetic energy is used for calculating velocity head the equation of velocity head are

            h_{v =} v² /2* g  ;h_{v =} E_v  /g  ;h_{v =} E_v * g_c /g

112.           A mass of fluid at high elevation will have more energy than an identical mass of fluid at a lower elevation. What is the name of this energy?

A.     Kinetic  energy

B.      Total Kinetic  energy

C.     Potential energy.

D.    Total   Potential energy.

  ANS: C

  EXP: A mass of fluid at high elevation will have more energy than an identical mass of fluid at a lower elevation the name of this energy is Potential energy.

113.          A mass of fluid at high elevation will have more energy than an identical mass of fluid at a lower elevation the name of this energy is Potential energy. Which of the following is the equation of elevation head?

A.     h_{v =} E_v  /g

B.     h_{v =} E_v * g_c /g

C.     h_{z =} E_z * g_c /g

D.    h_{z =} E_v  /g

  ANS: C

  EXP: the equation of elevation head h_{z =} E_z * g_c /g

114.            The hydraulic grade line is the graph of pressure head. What does it represent?

A.      The height of water column

B.      The height of water row

C.      Total elevation head

D.     Total velocity head

  ANS: A

  EXP: The hydraulic grade line is the graph of pressure head it represent the height of water column.

115.          The hydraulic grade line is the graph of pressure head it represent the height of water column. Which is the reason for changing pressure head?

A.     Change in elevation head

B.      Change in water head

C.      Change in potential energy

D.     Change in velocity head

  ANS: D

  EXP: The hydraulic grade line is the graph of pressure head it represent the height of water column. Pressure head changes depending on Changes in velocity.

116.          Pressure head changes depending on Changes in velocity head the HGL can also change in elevation. What is the condition for this change?

A.     If Change in potential energy

B.      If Change in water head

C.       If the flow area changes

D.    If  Change in velocity head

  ANS: C

  EXP: Pressure head changes depending on changes in velocity head the HGL can also change in elevation if the flow area changes

117.           The energy line is a graph of the total energy along a length of the pipe. What should be the constant factor in a friction less pipe without pumps or turbine?

A.     Total kinetic energy

B.     Total specific energy

C.       Total potential energy

D.     Total pressure.

  ANS: B

  EXP: The energy line is a graph of the total energy along a length of the pipe. In a friction less pipe without pumps or turbine the total specific energy Is constant.

118.          The energy line is a graph of the total energy along a length of the pipe. In a friction less pipe without pumps or turbine the total specific energy is constant and the EL will be horizontal. What would be the name of this statement?

A.     Energy equation

B.      Bernoulli’s  equation

C.     Continuity   equation

D.    Bounty force  equation

  ANS: B

  EXP: The energy line is a graph of the total energy along a length of the pipe. In a friction less pipe without pumps or turbine the total specific energy is constant and the EL will be horizontal. This is a restatement of Bernoulli’s equation.

119.          The energy line is a graph of the total energy along a length of the pipe. In a friction less pipe without pumps or turbine the total specific energy is constant and the EL will be horizontal. This is a restatement of Bernoulli’s equation. What is the other name of Bernoulli’s equation?

A.     Continuity   equation

B.     Energy equation

C.      Bounty force  equation

D.     Field equation

  ANS: D

  EXP: The energy line is a graph of the total energy along a length of the pipe. In a friction less pipe without pumps or turbine the total specific energy is constant and the EL will be horizontal. This is a restatement of Bernoulli’s equation. The Bernoulli’s equation also known as Field equation.

120.           The total head at any two points is the same. Which of the following equation support this statement?

A.     Continuity   equation

B.     Energy equation

C.      Bernoulli’s equation

D.     Field equation

  ANS: C

  EXP: The energy line is a graph of the total energy along a length of the pipe. In a friction less pipe without pumps or turbine the total specific energy is constant and the EL will be horizontal. This is a restatement of Bernoulli’s equation. In other words the states that the total head at any two points is the same.