Which of the following gas is evolved when sodium bisulphite reacts with sulphuric acid?

SO₂

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SO₃

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H₂S

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CO₂

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Solution

The correct option is A
SO₂

Sodium bisulphite reacts with sulphuric acid to form sodium sulphate , water and sulphur dioxide gas.

$2 N a H S O_{3} + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H_{2} O + 2 S O_{2} ↑$

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Which gas is evolved when sodium metal reacts with water?

H_{2}

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