In black and white photography, the developed film is fixed by washing with hypo solution which dissolves the under composed $A g B r$ to form a complex ion formed is:

[A g (S_{2} O_{3})_{2}]^{2 -}

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[A g (S_{2} O_{3})_{2}]^{3 -}

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[A g (S_{2} O_{3})_{2}]^{-}

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none of these

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Solution

The correct option is C $[A g (S_{2} O_{3})_{2}]^{3 -}$
Complex ion of sodium argentothiosulphate is formed when an undecomposed AgBr is washed with hypo solution in photography. $A g B r + 2 N a_{2} S O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$ Hence the option B is correct.

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Similar questions

A g B r

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

A g B r

{A g N O}_{3}

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

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[A g (S_{2} O_{3})_{2}]^{3 -}

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

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