Chemical Kinetics Quiz 6 – Punjab Meritorious School Preparation Portal

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What is the half-life of a radioactive substance if 87.5% of any given amount of the substance disintegrates in 40 minutes ?

20 minutes

10 minutes

13 minutes 32 sec

160 minutes

0.75/k

0.69/k

0.29/k

0.10/k

A chemical reaction is catalyzed by a catalyst X. Hence X

reduces enthalpy of the reaction

decreases rate constant of the reaction

increases activation energy of the reaction

does not affect equilibrium constant of the reaction

1700 sec

1600 sec

2000 sec

1200 sec

Activation energy of a chemical reaction can be determined by

evaluating rate constant at standard temperature

evaluating velocities of reaction at two different temperatures

evaluating rate constants at two different temperatures

changing concentration of reactants

The half-life of a reaction is inversely proportional to the square of the initial concentration of the reactant. Then the order of the reaction is

For an exothermic reaction, the energy of activation of the reactants is

equal to the energy of activation of products

less than the energy of activation of products

greater than the energy of activation of products

sometimes greater and sometimes less than that of the products

Consider the following statements:

I and IV

II and V

III and IV

II and III

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