Question

A plot of $\log (a-x)$ against time $t$ is a straight line. This indicates that the reaction is of:

• A. Zero order
• B. First order
• C. Second order
• D. Third order

Answer 1

Answer: (B)

First order

First order reaction gives a straight line plot of $\log (a-x)$ and time.
The Integrated rate law for the first order reaction is given as-

$k=\frac{2.303}{t}log\frac{a}{a-x}$

Option B is correct.