Assertion :On cooling, the brown colour of $N O_{2}$ disappears. Reason: On cooling $N O_{2}$ forms dimer $(N_{2} O_{4})$ resulting in the pairing of the odd electrons in $N O_{2}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

So, formation of colourless gas is due to formation of $N_{2} O_{4}$

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Choose the correct option.

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