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Question

Concentrated HNO3, upon long standing, turns yellow-brown due to the formation of
(IIT-JEE, 2012)

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
4HNO32H2O+4NO2+O2
NO2 remains dissolved in HNO3 colouring it yellow or even red at higher temperature.

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