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Question

Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of:

A
NO
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B
NO2
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C
N2O
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D
N2O4
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Solution

The correct option is B NO2
Conc. HNO3 decomposes partly on long standing in light as follows:
2HNO3H2O+2NO2+12O2
This NO2 gets dissolved in remaining HNO3 and turns its color yellow-brown which is due to unpared electrons in NO2

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