Question

Consider the following in respect of zero order reaction
I. $t_{1/2}$ is directly proportional to the initial concentration
II. Time taken for the completion of the reaction is twice its $t_{1/2}$
III. Concentration of the reactant decreases linearly with time
Which of the statements given above are correct?

• A. I & II only
• B. I & III only
• C. II & III only
• D. I, II & III

Answer 1

Answer: (D)

For zero order
(i) $t_{1/2}=\frac{a}{2K}$
$t_{1/2}\propto a$
(ii) $x=Kt$
$K=\frac{x}{t}\to t_{1/2}=\frac{a}{2\times \frac{x}{t}}$
$t_{1/2}\Rightarrow \frac{a\times t}{2x}$
$\therefore t\Rightarrow \frac{2t_{1/2}}{a}\times x$
(iii) concentration decreases with time.