Name the gas evolved in each case (formula is not acceptable).
The gas produced on heating sodium nitrate.

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Solution

Heating sodium nitrate results in the decomposition of sodium nitrate.
And sodium nitrate becomes converted to sodium nitrite and oxygen gas is liberated.
The chemical equation for this reaction is,
$\underset{S o d i u m n i t r a t e}{2 N a N O_{3} (s)} \overset{H e a t}{\to} \underset{S o d i u m n i t r i t e}{2 N a N O_{2} (s)} + \underset{O x y g e n}{O_{2} (g)}$
So the gas liberated is Oxygen gas.

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