What is the balanced chemical equation for developing photographic films?

2 A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g_{2} (S_{2} O_{3})_{2}] + 2 N a B r

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A g B r + N a_{2} S_{2} O_{3} \to N a [A g (S_{2} O_{3})_{2}] + N a B r

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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

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2 A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{2} [A g_{2} (S_{2} O_{3})_{2}] + 2 N a B r

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Solution

The correct option is D $A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$
AgBr react with sodium thiosulphate (hypo) to give soluble sodium argentothiosulphate.

$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$

The light sensitized photographic film is treated with hydroquinone which is a very mild reducing agent. It does not affect the unexposed silver bromide.
Unexposed $A g B r$ is dissolved in $N a_{2} S_{2} O_{3}$ (hypo) to give sodium argentothiosulphate

Hence,option C is correct.

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A g B r + 2 S_{2} O_{3}^{2 -} ⟶ [A g (S_{2} O_{3})_{2}]^{3 -} + B r^{-}

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AgCl dissolved in excess $N H_{3}$ , $K C N$ and $N a_{2} S_{2} O_{3}$ solutions the complex produce ions.

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

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