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Chemical Kinetics MCQ

1. What percentage of the reactant will be left behind after 120 minutes, if the half-life period of a first order reaction is 60 minutes?

30%

25%

40%

20%

Answer

Correct Answer: 25%

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2. In an exothermic reaction, if Ef and Er are the activation energies of forward and reverse reactions, then:

None

Ef < Er

Ef = Er

Ef > Er

Answer

Correct Answer: Ef < Er

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3. The half-life for the decomposition of N2O5 is 1, 117.75. What is the first order rate constant for this decomposition?

6.2 x 10-2s-1

6.2 x 10-4s-1

6.5 x 10-2s-1

6.5 x 10-4s-1

Answer

Correct Answer: 6.2 x 10-4s-1

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4. What is the time in sec required for a reaction to be 60% complete, if the rate constant for a first order reaction is:

1900

200

1200

Answer

Correct Answer: 1200

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5. The half-life period for a reaction is 0.693. What will be the time required for the completion of 99% of a first order reaction?

2 x 2.303 days.

2.303 x 3 days

6.303 x 2.693 days.

2.303 x 0.693 days.

Answer

Correct Answer: 2 x 2.303 days.

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6. In a photochemical reactions:

The temperature has the same effect as on thermal reactions

Temperature may have little in certain cases

The temperature has opposite effect as on thermal reactions

Temperature has no effect

Answer

Correct Answer: Temperature has no effect

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7. The catalyst used for heterogeneous catalysis is:

Liquid

Gas

Solid

None

Answer

Correct Answer: Solid

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8. What is the value of energy of activation for the reaction if the heat of a reaction is 20 kcal?

Cannot be predicted

< 20 kcal.

=20 kcal.

>20 kcal.

Answer

Correct Answer: >20 kcal.

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9. In the Arrhenius equation K = A exp (-E/RT), A may be termed as the rate constant at:

Infinite temperature

Moderate temperature

High temperature

Low temperature

Answer

Correct Answer: Infinite temperature

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10. The role of catalyst in a chemical reaction is to change:

Activation energy

Heat of reaction

Products of reaction

Equilibrium constant

Answer

Correct Answer: Activation energy

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11. Quantum yield of photosynthesis is:

HCl > HBr

HCl = HBr

HCl < HBr

None

Answer

Correct Answer: HCl > HBr

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12. The rate constant of a reaction is 1.2 x 10-3 sec-1 at 30°C and 2.1 x 10-3 sec-1 at 40°C. Calculate the energy of activation of the reaction.

12.45 kJ mol-1

44.13 kJ mol-1

67.32 kJ mol-1

98.76 kJ mol-1

Answer

Correct Answer: 44.13 kJ mol-1

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13. The relation between the initial concentration, the order of the reaction and the half life period is:

T a an-1

T a an

T a 1/an-1

T a 1/an

Answer

Correct Answer: T a 1/an-1

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14. The factors on which the rate of reaction depends is:

Presence of light

All

Temperature

Presence of catalyst

Answer

Correct Answer: All

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15. When retinal absorbs a photon of light it undergoes:

Chemical change

Photochemical change

None

Isomerisation

Answer

Correct Answer: Isomerisation

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16. Find the order of the reaction, if the rate of a gaseous reaction is halved when the volume of the vessel is doubled.

Answer

Correct Answer: 1

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17. If the activation energy of a reaction is zero, then the rate constant (K) of the reaction:

Increases with the increase in temperature

Decreases with the decrease in temperature

Is nearly independent of temperature

Answer

Correct Answer: Is nearly independent of temperature

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18. For first order reaction, the graph between rate of reaction vs concentration is:

Non- linear

Curved

Linear

None

Answer

Correct Answer: Linear

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19. Which among the following is not an example of first order reaction?

Decomposition of ammonium nitrite

Decomposition of ammonia

Decomposition of SO2Cl2

Decomposition of hydrogen peroxide

Answer

Correct Answer: Decomposition of ammonia

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20. The unit of the rate of reaction is:

Mol -1 L min-1

Mol L-1 min -1 And mol -1 L min-1

None

Mol L-1 min -1

Answer

Correct Answer: Mol L-1 min -1

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Engineering MCQs | Topic-wise

MCQ on Basic Engineering	MCQ on Chemical Engineering
MCQ on Chemical Kinetics	MCQ on Civil Engineering
MCQ on Digital Logic	MCQ on Educational Technology
MCQ on Electrical Engineering	MCQ on Electronic Devices
MCQ on Electronics Engineering	MCQ on Mechanics Engineering
MCQ on Networks & Telecommunication	General Engineering MCQs