What colour does the compound dinitrogen trioxide appear in its liquid state?

Colourless

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Blue

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Green

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Yellow

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Solution

The correct option is B Blue
Dinitrogen trioxide $(N_{2} O_{3})$ is found to be blue in colour in both its liquid and solid state. The blue colouration tends to appear because dinitrogen trioxide is a radical pair of nitric oxide and nitrogen dioxide that tend to absorb strongly in the visible region to appear bright blue.

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