STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

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Pre-exponential factors for the forward and backward reactions are $10^{15} \mathrm{~s}^{-1}$ and $10^{11} \mathrm{~s}^{-1}$, respectively. If the value of $\log \mathrm{K}$ for the reaction at $500 \mathrm{~K}$ is $6$ , the value of $\left|\log \mathrm{k}_{\mathrm{b}}\right|$ at $250 \mathrm{~K}$ is $\qquad$

$[\mathrm{K}=$ equilibrium constant of the reaction

$\mathrm{k}_{\mathrm{f}}=$ rate constant of forward reaction

$\mathrm{k}_{\mathrm{b}}=$ rate constant of backward reaction]