Sodium thiosulphate, Na₂S₂O₃ .5H₂O is used in photography to :

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remove undecomposed AgBr as soluble silver thiosulphate complex

remove reduced silver

Reduce the silver bromide to metallic silver

Convert the metallic silver to silver salt

answer is C.

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Detailed Solution

Sodium thiosulphate ${Na}_{2} S_{2} O_{3} \cdot 5 H_{2} O$ is used in photography to remove undecomposed AgBr as soluble silver thiosulphate complex.
$AgBr + 2 {Na}_{2} S_{2} O_{3} ⟶ {Na}_{3} [Ag {(S_{2} O_{3})}_{2}] + NaBr$

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