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Question

For a given reversible reaction if the concentrations of the reactants are quadrupled, the equilibrium constant will be


A

be quadrupled

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B

be one fourth of the previous value

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C

remain the same

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D

be halved

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Solution

The correct option is C

remain the same


Always remember: When we talk about a "particular” equilibrium, we uniquely identify it by a temperature. Unless otherwise specified, the temperature does not change.
Characteristics of equilibrium constant (Kp)
1 For a given reaction, the value of the equilibrium constant depends only on the temperature.
2.It is independent of the direction from which the equilibrium is attained or the initial concentrations of the reacting species
3.It is independent of Volume or the presence of catalysts
4.Kp does not change due to the presence of inert gases

All these shall be applicable for the other equilibrium constant Kcas well. The difference between the two is the way in which the "active mass” is expressed. If we use molar concentrations then we are utilizing Kc. On the other hand, if we use partial pressures, then Kpis implied. Other active masses like mole fractions might also be used to derive a new form of equilibrium constant.


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