An orange solid A on heating gives a colourless gas B. The gas B in dry condition is passed over heated Ca to give a solid C. The solid C further reacts with water to produce gas D, which forms a blue coloured compound Eon reaction with copper sulphate solution. Identify A, B, C, D, E and give the sequence of reactions involved.

An orange solid A on heating gives a colourless gas B. The gas B in dr

1.	An orange solid A on heating gives a colourless gas B. The gas B in dry condition is passed over heated Ca to give a solid C. The solid C further reacts with water to produce gas D, which forms a blue coloured compound Eon reaction with copper sulphate solution. Identify A, B, C, D, E and give the sequence of reactions involved.
Answer» SOLUTION :The orange solid A is ammonium dichromate `(NH_4)_2Cr_2O_7`. The reactions can be explained as under : `underset("Ammonium dichromate")((NH_4)_2Cr_2O_7) overset(Delta)to underset("NITROGEN gas ")(N_2) + 4H_2O + Cr_2O_7` `underset(B)(N_2) + 3Ca overset(Delta) tounderset("Calcium nitride")(Ca_3N_2)` `underset(C)(Ca_3N_2) + 6H_2O to 3Ca(OH)_2 + underset("Ammonia D")(2NH_3)` `4NH_3(aq) + Cu^(2+)(aq) to underset("Tetraamminecopper ion E (DEEP blue )")[Cu(NH_3)_4]^(2+)(aq))`