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Question

What can be said if a reaction has a small value for K ( equilibrium constant)?

A
The concentration of the un-ionized molecules must be relatively small compared with the ion concentrations
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B
The concentration of the ionized molecules must be larger than the ion concentrations
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C
The substance ionizes to a large degree
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D
The concentration of the un-ionized molecules must be relatively large compared with the ion concentrations
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Solution

The correct option is D The concentration of the un-ionized molecules must be relatively large compared with the ion concentrations
If a reaction has a small value for K, the equilibrium constant, the concentration of the un-ionized molecules must be relatively large compared with the ion concentrations.The equilibrium constant is the ratio of the concentrations of products to the concentrations of reactants. The concentration terms are raised to appropriate stoichiometric coefficients. Low value of equilibrium constant means the product concentrations are lower than the reactant concentrations. Hence, the equilibrium lies more towards left. Due to this, the degree of dissociation is low.

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