Question

Study the figure given below and mark the correct statement about $K_c$ and dependence of extent of reaction on it.

• A. X- Reaction does not occur; Y - Reaction proceeds to completion; Z - Reaction does not occur
• B. X- Reaction completes; Y - Reaction does not occur; Z - Reactants and products are at equilibrium
• C. X - Reaction hardly occurs; Y - Reactants and products are at equilibrium; Z - Reaction proceeds completion
• D. X - Reaction proceeds completion; Y - Reactants and products are at equilibrium; Z - Reaction hardly occurs

Answer 1

The correct option is C X - Reaction hardly occurs; Y - Reactants and products are at equilibrium; Z - Reaction proceeds completion

If $K_c>{10}^{-3}$, products predominate over reactants, i.e., if $K_c$ is very large, the reaction proceeds nearly to completion. (X- hardly occurs)

If $K_c<{10}^{-3}$ reactants predominate over products, i.e., if Kc is very small, the reaction proceeds rarely. (Z- Reaction proceeds completion)

If $K_c$ is in the range of ${10}^{-3}to{10}^3$, appreciable concentrations of both reactants and products are present.(Y- Reactants and products are at equilibrium)