1.

A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate. The gas (B) turns potassium dichromate acidified with dil H_(2)SO_(4) to a green coloured solution (C). A, B and C are respectively.........

Answer»

`Na_(2) SO_(3), SO_(2)Cr_(2) (SO_(4))_(3)`
`Na_(2) S_(2)O_(3), SO_(2)Cr_(2) (SO_(4))_(3)`
`Na_(2) S, SO_(2), SO_(2)Cr_(2) (SO_(4))_(3)`
`Na_(2) SO_(4), SO_(2), Cr_(2) (SO_(4))_(3)`

Solution :`underset("(A)")(Na_(2) S_(2)O_(3)) + 2HCl to 2NaCl+ underset("(B)")(SO_(2)UARR)+ underset("YELLOW ppt.")(Sdarr)+ H_(2)O`
`K_(2)Cr_(2)O_(7) + H_(2)SO_(4)+ 3SO_(2) to K_(2)SO_(4)+ underset("(C)")(Cr_(2)(SO_(4))_(3))+ H_(2)O`


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