An inorganic compound reacts with $S O_{2}$ in aqueous medium to produce 'A'. 'A' on reaction with $N a_{2} C O_{3}$ gives compound 'B', which with sulphur, gives a substance 'C' which is used in photography. Compound 'C' is :

N a_{2} S

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N a_{2} S_{2} O_{7}

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N a_{2} S O_{4}

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N a_{2} S_{2} O_{3}

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Solution

The correct option is D $N a_{2} S_{2} O_{3}$
$C a {(O H)}_{2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a O H$
$6 N a O H + 4 S \to 2 N a_{2} S + N a_{2} S_{2} O_{3} + 3 H_{2} O$
C is $N a_{2} S_{2} O_{3}$ which is used in photography.
A is $C a (O H)_{2}$ .
B is $N a O H$ .

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