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Solid NaNO3 is heated in a closed vessel and decomposes as 2NaNO3(s) <=> 2NaNO2(s) + O2(g), releasing oxygen. At equilibrium, which statement is correct?

1. addition of NaNO2 favours reverse reaction
2. addition of NaNO3 favours forward reaction
3. increasing temperature favours forward reaction
4. increasing pressure favours reverse reaction

Correct answer: increasing temperature favours forward reaction

Solution

Adding solids (NaNO3 or NaNO2) does not shift the equilibrium; since the forward reaction is endothermic and produces gas, raising temperature drives it forward (and raising pressure pushes it back toward solids).

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