A black powder (x) when heated with NaCl and Conc. H2 SO4 liberates a greenish yellow gas (y). (y) on passing through liquor Ammonia liberates chemically inert gas (Z); and on passing through boiling KOH gives (A) and (B) along with H2O2 . (A) When heated with (x) liberates another gas (C) and KCl. Then gases liberated are
1. y = Cl2 ; Z = N2 ;C = O2
2. y = Cl2 ;C = N2 ;C = O2
3. y = O2 ;C = Cl2 ; Z = O2
4. y = Cl2 ;C = NH3 ; Z = O2
