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Question

In the thermal decomposition of patassium chlorate given as 2KClO3 (aq.)2KCl (aq.)+3O2 (g)
Here, law of mass action:

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

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 KClO3 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.

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