Q78 / 180 · NEET 2015 (Phase 1) · Chemistry

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

A
Zero
Correct answer
B
First
C
Second
D
More than zero but less than first

Solution

t_{1 / 2} \propto \frac{1}{{(a_{0})}^{n - 1}}

t_{1 / 2}

is independent of initial concentration i.e.

t_{1 / 2} \propto \frac{1}{{(a_{0})}^{1 - 1}}

(is constant)

i.e n = 1 (order of reaction)

Hence, the correct answer is option: 'B'.

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