Question

The value of $k_c$ for the reaction
$2A\rightleftharpoons B+C$ is $2\times {10}^{-3}$
At a given time the composition of reaction mixture is $\left[A\right]=\left[B\right]=\left[C\right]=3\times {10}^{-4}M$. In which direction the reaction will proceed?

• A. From left to right
• B. From right to left
• C. The reaction is at equilibrium
• D. First to the right than left

Answer 1

The correct option is B From right to left

At the given time,

$Q=\frac{\left[B\right]\left[C\right]}{[A{]}^2}$

$=\frac{(3\times {10}^{-4})(3\times {10}^{-4})}{(3\times {10}^{-4}{)}^2}=1$

$\because Q>K_C$

The reaction will proceed in backwards direction i.e. from right to left.