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Question

A chemical reaction was carried out at 300 K and 280 K. The rate constants were found to be K1 and K2 respectively then

A
K20.5K1
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B
K20.25K1
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C
K22K1
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D
K24K1
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Solution

The correct option is B K20.25K1
Let the rate constant at 300 K be K1. Temperature decrease of 10C, rate constant value becomes approximately half the original value.
Decrease in temperature = 20C
The rate constant, K2 at 280 C is K2=0.25K1
K2=0.25K1

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