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The rate constant of a reaction at 200K ...

The rate constant of a reaction at 200K is 10 times less than rate constant at 400K. Value of `E_a`? [R = gas constant]

A

`1842.4` R

B

`921.2` R

C

`460.6` R

D

`230.3` R

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The correct Answer is:
B
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