When a brown compound of Mn (A) ids treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH3 to give an explosive compound (C). The compound A, B and C are ……………
(a) MnO2 , Cl2 , NCl3
(b) MnO, Cl2 , NH4Cl
(c) Mn3O4 , Cl2 , NCl3
(d) MnO3 , Cl2 , NCl2