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For a reaction
, $\frac{d [X]}{dt}$ is equal to

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$k_{1} (a - x) - k_{2} (a - x)$

$k_{1} (a - x) + k_{2} (a - x)$

$k_{2} (a - x) - k_{1} (a - x)$

$- k_{1} (a - x) - k_{2} (a - x)$

answer is C.

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Detailed Solution

$\frac{- d [a - x]}{dt} = K_{1} [a - x] + K_{2} [a - x]$

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