$N a_{2} S_{2} O_{3}$ is used in photography for fixing the negative. It removes $A g B r$ by :

formation of the complex

(N a_{3} [A g (S_{2} O_{3})_{2}])

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oxidation of

B r^{-}

B r_{2}

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reduction of

A g^{+}

A g

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formation of double salt.

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Solution

The correct option is C formation of the complex $(N a_{3} [A g (S_{2} O_{3})_{2}])$ .
$N a_{2} S_{2} O_{3}$ is used in photography for fixing the negative. It removes $A g B r$ by the complex formation.
The reaction of the process is as follows:
$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$

Suggest Corrections

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