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Question

When freshly prepared, HNO3 is colourless. On long standing, it turns to yellow colour. Explain.

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Solution

Freshly prepared HNO3 is colorless. But on strong heating, it turns to NO2 by the reaction,
4HNO34NO2+2H2O+O2
Liberated NO2 dissolves in remaining acid and gives a brownish yellow color. So it appears like brownish yellow.
[Note: Color of No2 is Brown]

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