Question

Which of the following is an example of homogeneous equilibrium?
(A) $\text{2S}{\text{O}}_{\text{2}\left(\text{g}\right)}+{\text{O}}_{\text{2}\left(\text{g}\right)}\rightleftharpoons \text{2S}{\text{O}}_{\text{3}\left(\text{g}\right)}$
(B) $${\text{C}}_{\left(\text{s}\right)}+{\text{H}}_{\text{2}}{\text{O}}_{\left(\text{g}\right)}\rightleftharpoons \text{C}{\text{O}}_{\left(\text{g}\right)}+{\text{H}}_{\text{2}\left(\text{g}\right)}$$
(C) $\text{CaC}{\text{O}}_{\text{3}\left(\text{s}\right)}\rightleftharpoons \text{Ca}{\text{O}}_{\left(\text{s}\right)}+\text{C}{\text{O}}_{\text{2}\left(\text{g}\right)}$
(D) $\text{N}{\text{H}}_{\text{4}}\text{H}{\text{S}}_{\left(\text{s}\right)}\rightleftharpoons \text{N}{\text{H}}_{\text{3}\left(\text{g}\right)}+{\text{H}}_{\text{2}}{\text{S}}_{\left(\text{g}\right)}$

Answer 1

Hint:e state of chemical reaction where the rate of forward and backward reaction is the same. The homogeneous equilibrium is the homogeneous mixture of reactants and products. In homogeneous equilibrium, the reactants and products are in one phase. One phase means that the physical state of the reactants and products is the same.

Complete step-by-step answer:We know that the state of chemical reaction where the rate of forward and backward reaction is the same. The homogeneous equilibrium is the homogeneous mixture of reactants and products in one phase. One phase means that the physical state of the reactants and products is the same.We are given four reactions. In reaction (A), the reactants and products all are in gaseous state. Thus, the physical state of the reactants and products is the same.
In the reactions (B), (C) and (D), the reactants and products are not in the same physical state.
The homogeneous mixtures are indistinguishable from pure substances. Some examples of homogeneous mixtures are sugar, salt, water, dye, etc.
Thus, the example of homogeneous equilibrium is $\text{2S}{\text{O}}_{\text{2}\left(\text{g}\right)}+{\text{O}}_{\text{2}\left(\text{g}\right)}\rightleftharpoons \text{2S}{\text{O}}_{\text{3}\left(\text{g}\right)}$.

Thus, the correct option is (A) $\text{2S}{\text{O}}_{\text{2}\left(\text{g}\right)}+{\text{O}}_{\text{2}\left(\text{g}\right)}\rightleftharpoons \text{2S}{\text{O}}_{\text{3}\left(\text{g}\right)}$.

Note:The opposite of homogeneous equilibrium is the heterogeneous equilibrium. The heterogeneous equilibrium is the heterogeneous mixture of reactants and products. In heterogeneous equilibrium, the reactants and products are in two or more phases. Two or more phases means that the physical state of the reactants and products is not the same. Thus, the reactions (B), (C) and (D) are the examples of heterogeneous equilibrium.