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Question

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

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A
is tripled
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B
is halved
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C
is doubled
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D
remains unchanged
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Solution

The correct option is C is doubled
For a zero order reaction the half life will be:
t1/2=[R0]2k(1)
where, [R0] is the initial concentration of the reactant

After the concentration of the reactant is doubled:
[R0]'=2[R0].(2)

t1/2=[R0]2k.............(3)

Substituting (2) in (3)
t1/2=2×[R0]2k

From equation (1)
t1/2=2×t1/2

Hence, after doubling the concentration of the reactant, the half life period of zero order reaction will be doubled.

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