Chemical Kinetics MCQs

Chemical Kinetics MCQs

Our experts have gathered these Chemical Kinetics MCQs through research, and we hope that you will be able to see how much knowledge base you have for the subject of Chemical Kinetics by answering these multiple-choice questions.
Get started now by scrolling down!

1: The unit of the rate of reaction is:

A.   Mol -1 L min-1

B.   Mol L-1 min -1 And mol -1 L min-1

C.   None

D.   Mol L-1 min -1

2: Which among the following is not an example of first order reaction?

A.   Decomposition of ammonium nitrite

B.   Decomposition of ammonia

C.   Decomposition of SO2Cl2

D.   Decomposition of hydrogen peroxide

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

A.   Non- linear

B.   Curved

C.   Linear

D.   None

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

A.   Increases with the increase in temperature

B.   Decreases with the decrease in temperature

C.   Decreases with the decrease in temperature

D.   Is nearly independent of temperature

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

A.   1

B.   3

C.   O

D.   2

6: When retinal absorbs a photon of light it undergoes:

A.   Chemical change

B.   Photochemical change

C.   None

D.   Isomerisation

7: The factors on which the rate of reaction depends is:

A.   Presence of light

B.   All

C.   Temperature

D.   Presence of catalyst

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

A.   T a an-1

B.   T a an

C.   T a 1/an-1

D.   T a 1/an

9: 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.

A.   12.45 kJ mol-1

B.   44.13 kJ mol-1

C.   67.32 kJ mol-1

D.   98.76 kJ mol-1

10: Quantum yield of photosynthesis is:

A.   HCl > HBr

B.   HCl = HBr

C.   HCl < HBr

D.   None

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

A.   Activation energy

B.   Heat of reaction

C.   Products of reaction

D.   Equilibrium constant

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

A.   Infinite temperature

B.   Moderate temperature

C.   High temperature

D.   Low temperature

13: What is the value of energy of activation for the reaction if the heat of a reaction is 20 kcal?

A.   Cannot be predicted

B.   < 20 kcal.

C.   =20 kcal.

D.   >20 kcal.

14: The catalyst used for heterogeneous catalysis is:

A.   Liquid

B.   Gas

C.   Solid

D.   None

15: In a photochemical reactions:

A.   The temperature has the same effect as on thermal reactions

B.   Temperature may have little in certain cases

C.   The temperature has opposite effect as on thermal reactions

D.   Temperature has no effect

16: 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?

A.   2 x 2.303 days.

B.   2.303 x 3 days

C.   6.303 x 2.693 days.

D.   2.303 x 0.693 days.

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

A.   1900

B.   68

C.   200

D.   1200

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

A.   6.2 x 10-2s-1

B.   6.2 x 10-4s-1

C.   6.5 x 10-2s-1

D.   6.5 x 10-4s-1

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

A.   None

B.   Ef < Er

C.   Ef = Er

D.   Ef > Er

20: 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?

A.   30%

B.   25%

C.   40%

D.   20%