If a reversible reaction is carried out in a closed vessel, the reactant(s) is/are never used up completely. Explain the reaction with nan example.

Explanation

When a reversible reaction is carried out in a closed vessel, an equilibrium establishes between the reactants and the products. As a result, the reaction syste always contains a mixture of reactants and products. In other words, a reversible reaction occurring in a closed vessel never gets completed. consequently, the reactants are never used up.