Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.

SO₄^2-

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S^2-

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SO₃^2-

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None of these

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Solution

The correct option is C
SO₃^2-

Sodium sulphite warmed with dilute sulphuric acid to give sodium chloride, water and sulphur dioxide gas. So, sodium sulphite contains ${S O_{3}}^{2 -}$ ion.

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

Sulphur dioxide gas is colourless with a smell of burning sulphur. Sulphur dioxide changes orange/yellow solution of acidified potassium dichromate green.

$K_{2} C r_{2} O_{7} O r a n g e + H_{2} S O_{4} + 3 S O_{2} \to C r_{2} (S O_{4})_{3} G r e e n + K_{2} S O_{4} + H_{2} O$

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