Assertion :On cooling, the brown colour of nitrogen dioxide disappears. Reason: On cooling, $N O_{2}$ undergoes dimerisation resulting in the pairing of the odd electron 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
On cooling, $N O_{2}$ undergoes dimerisation resulting in the pairing of the odd electron in $N O_{2}$

$N O_{2} + N O_{2} ⇌ N_{2} O_{4}$
(Brown colour) (Colourless)

On cooling, the brown colour of nitrogen dioxide disappears.

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