Equilibrium constant, $K_c$ is independent of initial concentration. But if a system at equilibrium

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Equilibrium constant, $K_c$ is independent of initial concentration. But if a system at equilibrium is subjected to a change in the concentration of one or more of the reactants, then the system is no longer at equilibrium and net reaction takes place in some direction until the system returns to equilibrium once again. Le Chatelier's principle gives the qualitative prediction about the effect of a change in conditions on equilibrium. According to it, if a system is subjected to change in the conditions, system adjusts in such a way to reduce the effect of the change.\ According to Le Chatelier's principle, the equilibrium of a reversible reaction will not shift by

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(d) : A catalyst does not alter the state of equilibrium. It increases the rate of forward as well as backward reaction to the same extent. The only effect is that equilibrium is attained quickly.