1.

Sodium thiosulphate is used in photography

Answer»

To CONVERT metallic SILVER into silver salt
AgBr grain is reduced to non-metallic silver
To remove reduced silver
To remove undercomposed AgBr in the form of `Na_(3)[Ag[S_(2)O_(3))_(2)]` (a complex salt)

Solution :Sodium thiosulphates removes the undercompose
AgBr in the form of `Na_(3)[Ag(S_(2)O_(3))_(2)]` complex
`AgBr +2Na_(2)S_(2)O_(3) to Na_(3) [Ag(S_(2)O_(3))_(2)]+NaBr`


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