question_answer

Consider the following statements

I. Increase in concentration of reactant increases the rate of a zero order reaction

II. Rate constant k is equal to collision frequency A, if \[{{E}_{a}}=0\]

III. Rate constant k is equal to collision frequency A, if \[{{E}_{a}}=\infty \]

IV. In k us T is a straight line

V. In k vs 1 /T is a straight line

Correct statements are

A)  I and IV                               

B)  II and V

C)  III and IV                            

D)  ll and III

Correct Answer: B

Solution :

                The effect of temperature on rate constant is shown by Arrhenius equation. \[k=A{{e}^{-{{E}_{a}}/RT}}\] Here, if       \[{{E}_{a}}=0\Rightarrow k=A\] The plot of In k vs\[\frac{1}{T}\] is a straight line and its slope will be\[-{{E}_{a}}/R\]. Hence, statements II and V are correct,