Question

A reaction is $50$ % complete in $2hours$ and $75$ % complete in $4hours$. The order of reaction is:

• A. $0$
• B. $1$
• C. $2$
• D. $3$

Answer 1

Answer: (B)

$1$

The reaction is $50$% completed in $2$ hours and $75$% completed in $4$ hours. The reaction must be first order reaction as:

$t_{3/4}=2t_{1/2}$ for first order reactions.