Question

In the thermal decomposition of patassium chlorate given as $2KCl{O}_3(aq.)\to 2KCl(aq.)+3O_2\left(g\right)$
Here, law of mass action:

• A. Cannot be applied
• B. Can be applied
• C. Can be applied at low temperature
• D. Can be applied at high temp. and pressure

Answer 1

The correct option is A Cannot be applied

Law of mass action explains and predicts behaviors of solutions in dynamic equilibrium.
Specifically, it implies for a chemical reaction which is in equilibrium i.e. the ratio between the concentration of reactants and products is constant.
The thermal decomposition of $KCl{O}_3$ is an irreversible reaction and hence takes place only in the forward direction so no equilibrium is established.
Hence, the law of mass action is not applicable in this case.