Aqueous solution of a salt 'A', when mixed with NaoH solution and warmed, a black precipitate is formed. Black ppt. is filtered and dissolved in dil. H_(2)SO_(4) solution. The resulting solution gives a chocolate coloured precipitate with potassium ferrocyanide solution. the filtrate obtained after filtering off the black precipitate, upon warming with Zn and NaOH evolves a pungent smelling gas. the resulting solution also responds to the ring test. the filtrate does not evolve any gas when it is boiled with urea in the presence of H_(2)SO_(4). Q. The filtrate obtained after filtering off the black precipitate consists of:

Aqueous solution of a salt 'A', when mixed with NaoH solution and warm

1.	Aqueous solution of a salt 'A', when mixed with NaoH solution and warmed, a black precipitate is formed. Black ppt. is filtered and dissolved in dil. H_(2)SO_(4) solution. The resulting solution gives a chocolate coloured precipitate with potassium ferrocyanide solution. the filtrate obtained after filtering off the black precipitate, upon warming with Zn and NaOH evolves a pungent smelling gas. the resulting solution also responds to the ring test. the filtrate does not evolve any gas when it is boiled with urea in the presence of H_(2)SO_(4). Q. The filtrate obtained after filtering off the black precipitate consists of:
Answer» `NO_(2)^(-)` `NO_(3)^(-)` `CO_(3)^(2-)` `Cl^(-)` SOLUTION :`4Zn+NaNO_(3)+7NaOH to 4Na_(2)ZnO_(2)+2H_(2)O+underset("PUNGENT smell")(NH_(3)uarr)`