For the reaction $2 A ightleftharpoons B+\mathrm{C}, K_c=4 imes 10^{-3}$. At a given time, the c

Question

For the reaction $2 A ightleftharpoons B+\mathrm{C}, K_c=4 	imes 10^{-3}$. At a given time, the composition of reaction mixture is : $[A]=[B]=[C]=2 	imes 10^{-3} \mathrm{M}$. Then, which of the following is correct?

Professor PC Thomas Classes · Answer

(c) : For the reaction,\ $ \begin{aligned} & 2 A ightleftharpoons B+C ; K_C=4 	imes 10^{-3} \ & Q_{\mathrm{C}}=\frac{[B][C]}{[A]^2}=\frac{2 	imes 10^{-3} 	imes 2 	imes 10^{-3}}{\left[2 	imes 10^{-3}ight]^2}=1 \end{aligned} $ \ Since, $Q_C>K_C$ hence, the reaction will proceed in the direction of reactants (i.e., backward direction).