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Question

The half life of a reaction is 46 minutes when the initial concentration of the reactant is 0.4 mole/lit and 92 minutes when the initial concentration is 0.2 mole/ lit. The order of the reaction is:

A
0
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B
0.5
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C
2
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D
1
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Solution

The correct option is C 2
t1/2α[Ao]1nt1/2(1)=46minAo1=0.4mole/Lt1/2(2)=96minAo2=0.2mole/Lt1/2(1)t1/2(2)=(Ao1)1n(Ao2)1n(0.40.2)1n=46921n=1n=2(2)1n=12(2)1n=21
C option is correct.

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