1.

AgBr used in photography, is removed with the help of ……… called ………. And forms ………..

Answer»

`Na_(2)S_(2)O_(3)," hypo "Na_(3)[AG(S_(2)O_(3))_(2)]`
Hydroquinone, `Ag, AgNO_(3)`
`Na_(2),SO_(4)," hypo "Na_(3)[Ag(S_(2)O_(3))_(2)]`
`Na_(2)S_(2)O_(3)," sodium THIOSULPHATE, "Na_(3)[Ag(S_(2)O_(3))_(2)]`

SOLUTION :(ad)(a) and (d) are CORRECT.
Sodium thiosulphate is used which is called hypo and FORMS soluble complex `Na_(3)[Ag(S_(2)O_(3))_(2)]`
(b) and (c) are ruled out.


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