Question

When the concentration of a reactant of first order reaction is doubled, the rate becomes ______ times, but for ______ order reaction, the rate remains same.

Answer 1

When the concentration of a reactant of first order reaction is doubled, the rate becomes two times, but for zero order reaction, the rate remains same.

Explanation:

First-order reaction:

Rate = k[A]¹

⇒ Rate ∝ [A]

So, doubling [A] doubles the rate.

Zero-order reaction:

Rate = k[A]⁰ = k

The rate is independent of the concentration of reactant.