why will the value of Kc not change if more amunt of reactant is added at the same temperature? wont the concentration of the reactants increase and hence the value of Kc should also increase?

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Solution

If concentration of reactant is increased or concentration of product is decreased at equilibrium, equilibrium constant shifts towards right, forward reaction is favoured, product formation increases.
Thus K_c does not change with change in concentration of reactant.

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