Transition and InnerTransition Elements - Result Question 1

####1. Thermal decomposition of a Mn compound (X) at 513K results in compound (Y),MnO2 and a gaseous product. MnO2 reacts with NaCl and concentrated H2SO4 to give a pungent gas Z. X,Y and Z, respectively, are (2019 Main, 12 April II)

(a) K3MnO4,K2MnO4 and Cl2

(b) K2MnO4,KMnO4 and SO2

(c) KMnO4,K2MnO4 and Cl2

(d) K2MnO4,KMnO4 and Cl2

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Solution:

  1. Thermal decomposition of Mn compound (X), i.e. KMnO4 at 513K results in compound Y (i.e. K2MnO4),MnO2 and a gaseous product. MnO2 reacts with NaCl and concentrated H2SO4 to give a pungent gas Z (i.e. Cl2 ). The reactions involved are as follows :

2KMnO4(X)513KΔK2MnO4(Y)+MnO2+O2(g) MnO2+4NaCl+4H2SO4 MnCl2+4NaHSO4+2H2O+Cl2(g) (Z)  Pungent gas. 



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