Question

Which one of the following statements is incorrect about chemical equilibrium?

• A. Chemical equilibrium is attained whether we start with reactants or products
• B. Chemical equilibrium is dynamic in nature
• C. Chemical equilibrium, $CaCO _{3}(s) \rightleftharpoons CaO (s)+ O _{2}(g)$ is attained, when $CaCO _{3}(s)$ is heated in an open vessel
• D. At equilibrium, the concentration of each of the reactants and products becomes constant.

Answer 1

Answer: (C)

Statement (c) is incorrect.
It's correct form is as follows :
Chemical equilibrium cannot take place in an open vessel if one of the reactants or products is a gas.
Rest other statements are correct.