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Sodium thiosulphate $$(Na_2S_2O_3.5H_2O)$$ is used in photography to

A
Reduce silver bromide to metallic silver
B
Convert metallic silver to silver salt
C
Remove undecomposed $$AgBr$$ as a soluble silver thiosulphate complex
D
Remove unreduced silver
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Solution
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Correct option is C. Remove undecomposed $$AgBr$$ as a soluble silver thiosulphate complex
Sodium thiosulphate $$(Na_2S_2O_3.5H_2O)$$ is used in photography to remove undecomposed $$AgBr$$ as a soluble silver thiosulphate complex.

$$AgBr+2Na_2S_2O_3 \rightarrow Na_3[Ag(S_2O_3)_2]+NaBr$$

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