KVPY 2020-21 SA Exam Previous Papers

Question : 38 of 80

Marks: +1, -0

Among the following, the correct statement about the chemical equilibrium is:

Equilibrium constant is independent of temperature.
Equilibrium constant tells us how fast the reaction reaches equilibrium.
At equilibrium, the forward and the backward reactions stop so that the concentrations of reactants and products are constant.
Equilibrium constant is independent of whether you start the reaction with reactants or products.

Solution:

Equilibrium constant depends on temperature but it does not tell about the rate of a reaction. At equilibrium, the forward and the backward reactions move with the same rate therefore concentration of all the species becomes constant.
Equilibrium constant

(K_\eq)

value is independent of whether reaction has been started with reactants or products.

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