Zinc pieces are added to acidified solution of ${SO}_{3}^{2 -}$ .
Gas liberated can:

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turn lead acetate paper black

turn lime water milky

give white precipitate with ${AgNO}_{3}$ solution

decolourize acidified ${KMnO}_{4}$ solution

answer is A, D.

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Detailed Solution

Hydrogen sulphide gas is produced when zinc reacts with an acidified sulphite solution.
Lead acetate paper turns black when hydrogen sulphide gas is present.

$3 Zn + {SO}_{3}^{2 +} + 2 H^{+} \to 3 ZnO + H_{2} S ↑$

It also decolourize acidified ${KMnO}_{4}$ solution.

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