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Question

# The reaction Ak⟶ products, is of a zero order while the reaction Bk⟶ products, is a first order reaction. For what initial concentration of 'A' are the half lives of the two reactions equal? (Rate constant values are the same for both reactions)

A
(ln4) M
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B
2 M
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C
(log2) M
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D
(ln2) M
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Solution

## The correct option is A (ln4) MFor a zero order reaction, concentration at any time x=kt∴a2=k×t1/2, t1/2=a2k⟶(i) For a first order Reaction, t1/2=loge2k⟶(ii) From (i) and (ii), a2k=loge2k ⇒a=(loge4) M

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