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  4. When NaNO3 is heated in a closed vessel, oxygen is liberated and NaNO2 is left behind At equilibrium,

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Q. When $ NaNO_3$ is heated in a closed vessel, oxygen is liberated and $ NaNO_2$ is left behind At equilibrium,

IIT JEEIIT JEE 1986Equilibrium

Solution:

$ NaNO_3 \, ( s) \rightleftharpoons NaNO_2 \, (s) + \frac{1}{2} O_2 \, ( g), \, \triangle H > 0 $
$ NaNO_3$ and $ NaNO_2$ are in so lid state, changing their amount has no effect on equilibrium . Increasing temperature will favour forward reaction due to endothermic nature of reaction. Also, increasing pressure will favour backward reaction in which some $O_2(g )$ will combine with $ NaNO_2 \, ( s) $ forming $NaCO_3$