Which gas is released when dilute sulphuric acid is added to $N a_{2} S$ ?

S O_{2}

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H_{2} S

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S O_{3}

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O_{2}

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Solution

The correct option is D $H_{2} S$
$N a_{2} S + H_{2} S O_{4} (d i l) ⟶ N a_{2} S O_{4} + H_{2} S$

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H_{2} S

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Hydrogen gas is evolved when copper turnings are added to dilute sulphuric acid.

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