A salt on treatment with dilute H2SO4 evolves a colourless, odourless gas that turns lime water milky. The anion is

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A salt on treatment with dilute $H X_{2} SO X_{4}$ evolves a colourless, odourless gas that turns lime water milky. The anion is

Carbonate gives

CO X_{2}

CO X_{3} X^{2 -} + 2 H X^{+} CO X_{2} + H X_{2} O

, which is odourless and turns lime water milky as

CaCO X_{3}

. Sulphite gives pungent

SO X_{2}

, sulphide gives foul-smelling

H X_{2} S

and nitrite gives brown fumes.