JEE Advanced Chemistry question

Na2CO3 reacts with SO2 in alkaline medium to produce

(A)Na2SO4
(B)Na2SO3Correct
(C)NaHSO4
(D)NaHSO3

Answer: (B)

Solution

In alkaline (excess base) medium, Na2CO3 first hydrolyses/reacts to generate NaOH available in solution, which then absorbs SO2 to form the normal (fully neutralised) sulphite salt rather than the acid salt: 2NaOH + SO2 → Na2SO3 + H2O.

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Question ID VK-159439