Concentrated sulphuric acid on reaction with metal produces which of the following gas?

$S O_{2}$ gas

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$H_{2} O$ (water vapour)

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$H_{2}$ gas

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$H_{2} S$ gas

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Solution

The correct option is A
$S O_{2}$ gas

Concentrated sulphuric acid is not used in the preparation of $H_{2}$ as it will produce sulphuric gas on reaction with metal.

$H_{2} S O_{4} + Z n ⟶ S O_{2} + H_{2} O$

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