Sodium thiosulphate is called $I . . . . . . .$ and is used like $I I . . . . . . .$ and removes unreacted light sensitive $A g B r$ by forming the complex $I I I . . . . . . .$

I : h y p o, I I : d e v e l o p e r, I I I : [A g S_{2} O_{3}]^{-}

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I : h y p o, I I : f i x e r, I I I : [A g (S_{2} O_{3})_{2}]^{3 -}

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I : h y p o, I I : f i x e r, I I I : [A g_{2} (S_{2} O_{3})]

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None of the above is correct.

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Solution

The correct option is A $I : h y p o, I I : f i x e r, I I I : [A g (S_{2} O_{3})_{2}]^{3 -}$
Sodium thiosulphate is called as hypo solution and this is used as fixer and
removes unreacted light sensitive AgBr by forming the complex,

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

Hence option-(B) is correct.

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