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Nitric Acid

Name the gas ...

Question

Name the gas that is produced in the following cases.
Sulphur is oxidized by concentrated nitric acid.

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Solution

In excess concentrated $H N O_{3}$ , $S$ gets oxidised to $S O_{2}$ and then $H_{2} S O_{4}$ . Overall reaction is:
$S + 6 H N O_{3} \to 2 H_{2} O + H_{2} S O_{4} + 6 {N O}_{2} ↑$
Nitogen dioxide gas evolve.

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