Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO2 and gaseous product. mnO2 reacts with NaCl and concentrated H2O4 to give a pungent gas Z. X, Y and Z, respectively, are :
(1) KMnO4, K2MnO4 and Cl2
(2) K2MnO4, KMnO4 and SO2
(3) K3MnO4, K2MnO4 and Cl2
(4) K2MnO4, KMnO4 and Cl2
