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Question:

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.

K2MnO4,KMnO4andSO2

KMnO4,K2MnO4andCl2

K3MnO4,K2MnO4andCl2

K2MnO4,KMnO4andCl2

Solution:

Correct option is D. KMnO4, K2MnO4 and Cl2
2KMnO4 →Δ513K K2MnO4 + MnO2 + O2(g)
(X) (Y)
MnO2 + 4NaCl + 4H2SO4 → MnCl2 + 4NaHSO4 + 2H2O + Cl2(g)
(Z) pungent gas