Q.

Sodium thiosulphate Na2S2O3. 5H2O is used in photography to

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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

answer is C.

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Detailed Solution

AgBr  + 2Na2SO3   →  Na3AgS2O33 + NaBr
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Sodium thiosulphate Na2S2O3. 5H2O is used in photography to