S Block Elements Question 267
Question: Sodium thiosulphate $ (Na_2S_2O_3.5H_2O) $ is used in photography to
[CPMT 1972, 74, 79; DPMT 1983; Bihar CEE 1995; MNR 1995]
Options:
A) Reduce silver bromide to metallic silver
B) Convert metallic silver to silver salt
C) Remove undecomposed $ AgBr $ as a soluble silver thisulphate complex
D) Remove unreduced silver
Show Answer
Answer:
Correct Answer: C
Solution:
$ AgBr+2Na_2S_2O_3\to Na_3[Ag{{(S_2O_3)}_2}]+NaBr $
BETA
