On heating compuond (A) gives a gas (B) which is a constituent of air. This gas when treated with 3 mol of hydrogen (H_(2)) in the presence of a catalyst gives anther gas (C) which is basic in nature. Gas C on further oxidation in moist condition gives a compound (D) which is a part of acid rain. Identify compounds (A)to (D) and also give necessary equations of all the steps involved.

On heating compuond (A) gives a gas (B) which is a constituent of air.

1.	On heating compuond (A) gives a gas (B) which is a constituent of air. This gas when treated with 3 mol of hydrogen (H_(2)) in the presence of a catalyst gives anther gas (C) which is basic in nature. Gas C on further oxidation in moist condition gives a compound (D) which is a part of acid rain. Identify compounds (A)to (D) and also give necessary equations of all the steps involved.
Answer» Solution :(i) Since gas `B` on heating with 3 moles of hydrogen in PRESENCE of a catalyst, gives a gas `C` which is BASIC in nature, THEREFORE, 'C' must be ammonia `(NH_(3))` and gas (B) must be `N_(2)` `underset((B))(N_(2)) + 3H_(2) overset(DELTA, "Catalyst")(to) underset("Ammonia(C)")(2NH_(3))` (ii) Since gas 'B' (i.e., `N_(2)`) is obtained by heating compound (A) , therefore , compound (A) must be either ammonium nitrite or ammonium dichromate `underset((A))(NH_(4)) NO_(2) overset(Delta)(to) underset((B))(N_(2)) + 2H_(2)O or (NH_(4))_(2) underset((A))(Cr_(2)) O_(7) overset(Delta)(to) underset((B))(N_(2)) + Cr_(2) O_(3) + 4H_(2)O` (iii) Since gas 'C', (i.e., `NH_(3)`) on further oxidation in moist conditions gives compound (D) which is a part of acid rain, therefore, compound (D) must be nitric acid `(HNO_(3)`). `underset((C))4NH_(3)+5O_(2)overset("Oxidation")to4NO+6H_(2)O` `2NO+O_(2)to2NO_(2),3NO_(3)+H_(2)Otounderset((D))2HNO_(3)+NO` Thus, `A=NH_(4)NO_(2)or(NH_(4))_(2)Cr_(2)O_(7),B=N_(2),C=NH_(3)andD=HNO_(3)`.