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75% of a first order reaction occurs in ...

75% of a first order reaction occurs in 30 min at `27^(@)C` . 87.5% of the same reaction occurs in 30min at `57^(@)C` . The activation energy of reaction is:
[In 2=0.7, In 3=1.1]

A

`2.64 kJ//mol`

B

`2.64` Kcal/mol

C

`10.97` Kcal//mol

D

zero

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The correct Answer is:
B
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