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Q.

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

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a

1842.4 R

b

921.2 R

c

460.6 R

d

230.3 R

answer is B.

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Detailed Solution

logK2K1=Ea2.303R[T2−T1T1T2] log101=Ea2.303R[200200×400] 1=Ea2.303R×400 Ea=921.2 R
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The rate constant of a reaction at 200K is 10 times less than rate constant at 400K. Value of Ea ? [R = gas constant]