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  4. For a reversible reaction, if the concentrations of the reactants are doubled, the equilibrium constant will be

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Q. For a reversible reaction, if the concentrations of the reactants are doubled, the equilibrium constant will be

IIT JEEIIT JEE 2000Aldehydes Ketones and Carboxylic Acids

Solution:

Consider a hypothetical change, $ A+B \rightleftharpoons C+D$
For this reaction, $K_{eq}=\frac {[C][D]}{[A][B]}$
For the above reaction if concentration of reactants are doubled then the rate of forward reaction increases for a short time but after sometime equilibrium will established. So, concentration has no effect on equilibrium constant. It remains unchanged after increasing the concentration of reactants.