On additing (A) into a dilute solution of silver nitrate a white preci – InterviewSolution

1.	On additing (A) into a dilute solution of silver nitrate a white precipitate appears which quickly changes into a black coloured compound. (C)
Answer» Answer :The REACTIONS indicate that the COMPOUND (A) is sodium THIOSULPHATE. It is formed in step (i) by passing gas (B) which is either `I_(2)`. `2AgNO_(3)+ underset("(Whitw ppt)")(Na_(2)S_(2)O_(3) rarr) Ag_(2)S_(2)O_(3)+2NaNO_(3)` `Ag_(2)S_(2)O_(3)+underset((C)" black")(H_(2)Orarr) Ag_(2)S+H_(2)SO_(4)`

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