Out of the given compounds, how many of these produce a colourless gas when reacts with dilute HCl which decolourises KMnO $_{4}$ + dilute $H_{2} S O_{4}$ solution?
$N a_{2} C O_{3}, N a H C O_{3}, N a_{2} S O_{3}, N a_{2} S, N a_{2} S_{2} O_{3}, N a_{2} S O_{4}, N a N O_{2}$

4

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5

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3

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2

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Solution

The correct option is A $4$
Compound $N a_{2} S O_{3}$ $N a_{2} S$ $N a_{2} S_{2} O_{3}$ $N a N O_{2}$
Gas produced on reaction with $H C l$ $S O_{2}$ $H_{2} S$ $S O_{2}$ $H N O_{2}$
Product formed after oxidation with acidified $K M n O_{4}$ $H_{2} S O_{4}$ S $H_{2} S O_{4}$ $H N O_{3}$
$4$ out of $7$ given compounds on reaction with $H C l$ produce a gas.
When purple colored acidified $K M n O_{4}$ solution reacts with gas, it is decolourized to produce brown precipitate of $M n O_{2}$ .

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H_{2} S

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d i l u t e H C l

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Compound	$N a_{2} S O_{3}$	$N a_{2} S$	$N a_{2} S_{2} O_{3}$	$N a N O_{2}$
Gas produced on reaction with $H C l$	$S O_{2}$	$H_{2} S$	$S O_{2}$	$H N O_{2}$
Product formed after oxidation with acidified $K M n O_{4}$	$H_{2} S O_{4}$	S	$H_{2} S O_{4}$	$H N O_{3}$