1.

Concentrated nitric acid, upon long standing, turns yellow–brown due to the formation of(A) NO (B) NO2 (C) N2O (D) N2O4

Answer»

(B) NO2 

4HNO3 → 2H2 O + 4NO2 + O2

NO2 remains dissolved in nitric acid colouring it yellow or even red at higher temperature.



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