Question

In a certain reaction, $10$% of the reactant decomposes in one hour, $20$% in two hours. $30$% in three hours and so on the dimensions of the rate constant is:

• A. ${hour}^{-1}$
• B. $mole$ ${litre}^{-1}$ ${sec}^{-1}$
• C. $litre$ ${mole}^{-1}$ ${sec}^{-1}$
• D. $mole$ ${sec}^{-1}$

Answer 1

Answer: (B)

$mole$ ${litre}^{-1}$ ${sec}^{-1}$

Given reaction is a zero order reaction because on plotting the percent decomposition of reaction as time, we will obtain a straight line.

A straight line is a characteristic of a zero order reaction.

Since $K=\frac{x}{t}$ for a zero order reaction its units are mol/L.sec.

Therefore answer is [B].