An aqueous solution of a salt (A) forms a dense white precipitate with $BaCl_2$ solution. The precipitate dissolves in dilute HCl to produce a gas (B) which decolourises acidified $KMnO_4$ solution. A and B respectively are: - DASH

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Question

An aqueous solution of a salt (A) forms a dense white precipitate with $BaCl_2$ solution. The precipitate dissolves in dilute HCl to produce a gas (B) which decolourises acidified $KMnO_4$ solution. A and B respectively are:

$BaSO_3, H_2S$

$BaSO_4, SO_2$

$BaSO_3, SO_2$

$BaSO_4, H_2S$

Solution

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