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

A white crystalline salt [A] reacts with dilute HCl to liberate a suff

1.	A white crystalline salt [A] reacts with dilute HCl to liberate a suffocating gas [B] and also forms a yellow precipitate. The gas [B] turns potassium dichromate acidified with dilute H_(2)SO_(4) to a green coloured solution [C]. A,B ad C are respectively.
Answer» `Na_(2)SO_(3),SO_(2),Cr_(2)(SO_(4))_(3)` `Na_(2)S_(3)O_(3),SO_(2),Cr_(2)(SO_(4))_(3)` `Na_(2)S,SO_(2),Cr_(2)(SO_(4))_(3)` `Na_(2)SO_(4),SO_(2),Cr_(2)(SO_(4))_(3)` Solution :Dil. HCl decomposes `Na_(2)S_(2)O_(3)`(A) with evolution of a gas which possesses a suffocating smell of burning sulphur i.e., `SO_(2)(B)` and yellow ppt. of sulphur is OBTAINED. `underset((A))(Na_(2)S_(2)O_(3))+2HCl to 2NaCl+ underset((B))(SO_(2))uarr+underset(("yellow ppt."))(Sdarr)+H_(2)O` When acidified potassium dichromate paper is exposed to the gas, it attains a green colour due to the formation of CHROMIUM sulphate. `K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+3SO_(2) to K_(2)SO_(4)+underset((C)" Green")(Cr_(2)(SO_(4))_(3)+H_(2)O`