JEE Advance - Chemistry (2013 - Paper 1 Offline - No. 13)

Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of
NO
NO2
N2O
N2O4

Explanation

The reaction involved is 4HNO3 $$\to$$ 4NO2 + 2H2O + O2. The yellow-brown color appears due to the formation of NO2.

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