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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