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For following reactions A overset( 400...

For following reactions
`A overset( 400K)( rarr) ` Product
`A underset("catalyst")overset("200K")(rarr)` Product
it was found that the `E_(a)` is decreased by 20 kJ` //` mol in the presence of catalyst. If the rate remains unchanged, the activation energy for catalysed reaction is ( Assume per exponential factor is same ) `:`

A

105 kJ/ mol

B

120 kJ / mol

C

75 kJ/mol

D

135 kJ/mol

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The correct Answer is:
B
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