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The rate of disappearance of \( A \) at two temperature for the equilibrium \( A \rightleftharpoons B \) is given by:
\[
\begin{array}{ll}
-\frac{d[A]}{d t}=2 \times 10^{-2}[A]-4 \times 10^{-3}[B] & \text { at } 300 \mathrm{~K} \\
-\frac{d[A]}{d t}=4 \times 10^{-2}[A]-16 \times 10^{-4}[B] & \text { at } 400 \mathrm{~K}
\end{array}
\]
Calculate : equilibrium constants at \( 300 \mathrm{~K} \) and \( 400 \mathrm{~K} \)
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