Question

$K_C$ for the reaction,
$A_{\left(g\right)}+B_{\left(g\right)}\rightleftharpoons C_{\left(g\right)}+D_{\left(g\right)}$ is $20$ at $25{}^{\circ }\text{C}$. If a container contains $1,2,4,5$ moles per litre of $A_{\left(g\right)},B_{\left(g\right)},C_{\left(g\right)}$ and $D_{\left(g\right)}$ respectively at $25{}^{\circ }\text{C}$, then the reaction shall:

• A. Proceeds from left to right
• B. Proceeds from right to left
• C. Be at equilibrium
• D. None

Answer 1

The correct option is A Proceeds from left to right

$Q=\frac{\left[C\right]\left[D\right]}{\left[A\right]\left[B\right]}=\frac{4\times 5}{1\times 2}=10K_c=20\therefore Q<K_c$
Therefore equilibrium will shift from left to right.