[CBSE PMT 1988; Pb. CET 1989]
A) Reduce $ AgBr $ grains to metallic silver
B) Convert the metallic silver to silver salt
C) Remove undecomposed silver bromide as a soluble complex
D) Remove reduced silver
Correct Answer: C
$ AgBr+2Na_2S_2O_3\to Na_3[Ag{{(S_2O_3)}_2}]+NaBr $
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