Chemical used in photography:

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

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N a_{2} S

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N a H S O_{3}

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N a_{2} S O_{3}

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Solution

The correct option is B $N a_{2} S_{2} O_{3}$
$N a_{2} S_{2} O_{3}$ is used in dissolving unreacted silver
halides in photography

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N a_{2} C O_{3} S O_{2} - - \to (A) N a_{2} C O_{3} - ---- \to (B) S \to (C) A g N O_{3} - --- \to (D)

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