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Which of the following salt would give $SO_2$ with hot and dil. $H_2SO_4$ and also decolourise $Br_2$ water?

(a) $Na_2SO_3$
(b) $NaHSO_4$
(c) $Na_2SO_4$
(d) $Na_2S$
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Answer: $Na_2SO_3$
$Na_2SO_3 + H_2SO_4 \longrightarrow Na_2SO_4 + SO_2 \uparrow + H_2O$
Sodium sulphate decolourises bromine water.
$Br_2 + H_2O \longrightarrow 2HBr$ (colourless) $ + [O]$
$Na_2SO_3 + [O] \longrightarrow Na_2SO_4$
answered Jan 28, 2014 by mosymeow_1

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