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Half life

Half-life of ...

Question

Half-life of a reaction is found to be inversely proportional to the cube of initial concentration. The order reaction is

A

2

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B

5

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C

3

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D

4

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Solution

The correct option is D 4
$t_{0} .5 \propto \frac{1}{a^{n - 1}}$
Given $t_{0} .5 \propto \frac{1}{a^{3}}$
Hence, $n - 1 = 3$
$∴ n = 4$

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