A metal sulphide A gives gas B with rotten egg smell and a colourless sulphate C, when treated with dil H_2SO_4. B reacts with K_2Cr_2O_7//H^+ to form D, a white grey element. D burns in oxygen to yield E a colourless gas. If B is added to E, it gives D and a colourless liquid, which turns anhydrous CuSO_4 blue. C gives precipitate with NH_(3(aq)) or NaOH, which dissolves in excess of NaOH

A metal sulphide A gives gas B with rotten egg smell and a colourless

1.	A metal sulphide A gives gas B with rotten egg smell and a colourless sulphate C, when treated with dil H_2SO_4. B reacts with K_2Cr_2O_7//H^+ to form D, a white grey element. D burns in oxygen to yield E a colourless gas. If B is added to E, it gives D and a colourless liquid, which turns anhydrous CuSO_4 blue. C gives precipitate with NH_(3(aq)) or NaOH, which dissolves in excess of NaOH
Answer» `CuSO_4` `BaSO_4` `ZnSO_4` `Na_(2)ZnO_2` Solution :`underset((A))(ZNS )+ H_2SO_4 rarr underset((B))(H_2S) + underset((C))(ZnSO_4)` `H_2S + K_2Cr_2O_7 rarr underset((D))(S+Cr_2O_3)` `S+O_2 rarr underset((E)) SO_2` `H_2S + SO_2 rarr S + H_2O` `CuSO_4 + H_2O rarr underset((BLUE))(CuSO_4.) 5H_2O` `ZnSO_4 + NaOH rarr underset((white))(Zn(OH)_2darr) overset(NaOH) rarr underset("(SOLUBLE)")(Na_2ZnO_2)`