Which of the following salts would give $S O_{2}$ with dil. $H_{2} S O_{4}$ and also decolourises bromine water?

N a_{2} S O_{4}

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N a H S O_{4}

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N a_{2} S O_{3}

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N a_{2} S

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Solution

The correct option is B $N a_{2} S O_{3}$
Metal Sulphites on reacting with dilute acids evolve sulphur dioxide gas. This evolved sulphur dioxide gas is capable of decolourising bromine water. For example, $N a_{2} S O_{3} + 2 H C l (d i l) \to 2 N a C l + S O_{2} + H_{2} O$
Similarly, sodium sulphite ( $N a_{2} S O_{3}$ ) evolves $S O_{2}$ with dilute $H_{2} S O_{4}$ .

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