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Question

Nitric acid is generally colourless. What gives it a yellowish shade?

A
Solubility in water
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B
Decomposition in the presence of light
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C
Strong acidic nature
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D
Formation of azeotropic mixture
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Solution

The correct option is B Decomposition in the presence of light
The decomposition of concentrated nitric acid takes place in room temperature when initiated with absorption of light energy. It decomposed to nitrogen dioxide, water and oxygen thus giving a brownish yellow shade.
4HNO3 presence of light−−−−−−−−−−−− 2H2O +4NO2 + O2

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