A chemical reaction was carried out at 300 K and 280 K. The rate constants wer

Question -

A chemical reaction was carried out at 300 K and 280 K. The rate constants were found to be $K_{1}$ and $K_{2}$ respectively then

Options:

A .

K_{2} \approx 0.5 K_{1}

B .

K_{2} \approx 0.25 K_{1}

C .

K_{2} \approx 2 K_{1}

D .

K_{2} \approx 4 K_{1}

Answer: Option B
:
B
Let the rate constant at 300 K be

K_{1}

. Temperature decrease of

10^{\circ} C

, rate constant value becomes approximately half the original value.
Decrease in temperature =

20^{\circ} C

The rate constant,

K_{2}

at 280 C is

K_{2} = 0.25 K_{1}

K_{2} = 0.25 K_{1}

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