Question

The half-life of a reaction is doubled when the initial concentration is doubled. The order of reaction is:

• A. $0$
• B. $2$
• C. $3$
• D. $1$

Answer 1

The correct option is A $0$

half-life $\propto$ initial concentration

This is the case with zero-order reaction,

where $t_{1/2}=\frac{a_0}{2k}$

The order of reaction is zero.

Hence, the correct option is $\text{A}$