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Sodium thiosulphate, Na(2)S(2)O(3).5H(2)...

Sodium thiosulphate, `Na_(2)S_(2)O_(3).5H_(2)O` is used in photography to

A

reduce the silver bromide grains to metallic silver.

B

convert the metallic silver to silver salt.

C

remove undecomposed `AgBr` as soluble silver thiosulphate complex.

D

remove reduced silver.

Text Solution

Verified by Experts

The correct Answer is:
C
The unreacted `AgBr` is removed by soluble complex formation
`AgBr+2Na_(2)S_(2)O_(3)rarr Na_(3)[Ag(S_(2)O_(3))_(2)]+NaBr`
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