Name the gas evolved in each case (the formula is not acceptable).
The gas produced by the action of concentrated sulphuric acid on sodium chloride.

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Solution

Sulfuric acid and Sodium chloride react together to form Hydrogen chloride gas.
Sodium sulfate is also obtained as a byproduct.
The chemical equation for the reaction is,
$\underset{S o d i u m c h l o r i d e}{2 N a C l (s)} + \underset{S u l f u r i c a c i d}{H_{2} S O_{4} (l)} \to \underset{H y d r o g e n c h l o r i d e}{2 H C l (g)} + \underset{S o d i u m s u l f a t e}{N a_{2} S O_{4} (a q)}$
So, the gas obtained is Hydrogen Chloride.

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