p-Block elementsHard

Question

A gaseous substance dissolve in water giving a pale blue solution which decolourises KMnO4 and oxidises KI to I2 in acidic medium :

Options

A.N2O5
B.NH3
C.N2O3
D.HNO3

Solution

N2O3 + H2O → HNO2 ; 2KMnO4 + 5KNO2 + 6HCl → 2MnCl2 + 5KNO3 + 3H2O + 2KCl
2KI + 2HNO2 + 2HCl → 2H2O + 2NO + 3KCl + I2

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