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A gas X is formed when a substance Y is ...

A gas X is formed when a substance Y is heated with concentrated sulphuric acid. The gas X turns wet blue litmus paper red and gives dense white fumes with ammonia.
Write balanced chemical equation between Y and conc. `H_2SO_4`

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`2NaCl + H_2SO_4overset("at "300^@C)(rarr) Na_2SO_4 + 2HCl(g)`
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