MCQ Temperature Dependence of Reaction, Class 12 Chemistry

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. In the equation k = A . e^-Ea/RT , A is known as

Boltzmann factor

Arrhenius factor

Kinetic factor

Rate constant

Your comments:

Question 1 of 10

2. If E_f and E_b are the activation energies of the forward and reverse reactions and the reaction is known to be exothermic, then:

E_f = E_b

E_f < E_b

Data insufficient to predict

E_f > E_b

Your comments:

Question 2 of 10

3. For a first order reaction it is observed that 3.6 x 10^-18 reactant molecules exist in the activated state of a reaction at 300 K. The activation energy of the reaction is:

250 kJ

150 kJ

200 kJ

100 kJ

Your comments:

Question 3 of 10

4. The effect of temperature on reaction rate is given by

Arrhenius equation

Kirchoff's Equation

Clauius Claperyron equation

Gibb's Helmholtz equation

Your comments:

Question 4 of 10

5. The activation energies of two reactions are given as E_a1= 40 J and E_a2= 80 J, then the relation between their rate constants can be written as:

A

B

C

D

Your comments:

Question 5 of 10

6. The activation energy of a chemical reaction can be determined by

Changing concentration of reactants

Evaluating rate constant at standard temperature

Evaluating rate constants at two different temperatures

Evaluating velocities of reaction at two different temperatures

Your comments:

Question 6 of 10

7. The rate constant, activation energy and Arrhenius parameter of a chemical reaction at 25°C are 3.0 x 10^-4 s^-1, 104.4 kJ mol^-1 and 6.0 x 10¹⁴ s^-1 respectively. The value of the rate constant at infinite temperature is is

Infinity

2 x 10¹⁸ s^-1

6.0 x 10¹⁴s^-1

6.0 x 10³⁰ s^-1

Your comments:

Question 7 of 10

8. The plot of ln k vs 1/T is a straight line. The slope of the graph is:

Infinity

-E_a/RT

ln A

E_a

Your comments:

Question 8 of 10

9. For a chemical reaction the rate constant is nearly doubled with the rise in temperature by

100ºC

10ºC

50ºC

273ºC

Your comments:

Question 9 of 10

10. The reactions with low activation energy are

Slow

Non-spontaneous

Fast

Always spontaneous

Your comments:

Question 10 of 10

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