Question

Which of the following is a reversible reaction?

• A. $KCl{O}_3$ is heated in a sealed tube.
• B. $N{a}_{2}C{O}_3$ is heated in a closed vessel.
• C. $CaC{O}_3$ is heated in a closed vessel.
• D. $C{H}_4$ is heated with excess of $O_2$ in a closed vessel.

Answer 1

The correct option is C $CaC{O}_3$ is heated in a closed vessel.

When calcium carbonate is heated in a closed vessel, it forms calcium oxide and carbon dioxide.
Since the vessel is closed, carbon dioxide cannot escape from the vessel. It recombines with calcium oxide to form calcium carbonate.

Hence, the reaction becomes reversible in a closed system.