Answer:
Let us consider the reaction \[A+B\underset{{}}{\leftrightarrows}C+D\]
Reaction Quotient \[{{Q}_{c}}=\frac{[C][D]}{[A][B]}\]
(I) When \[{{Q}_{c}}<{{K}_{c}}\]
then reaction will proceed in forward direction to increase the value of \[{{Q}_{c}},\]i.e.,
to attain equilibrium.
(ii) When \[{{Q}_{c}}>{{K}_{c}}\]
then reaction will be fast in backward direction, i.e., it will proceed in
backward direction to decrease the value of \[{{Q}_{c}}\]
(iii) When\[{{Q}_{c}}={{K}_{c}}\],
the reaction is at equilibrium, i.e., there is no net reaction.
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