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

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The position of the equilibrium between the two compounds and the colour of the system varies with temperature. Below $21^{o} C$ , only pure, solid $N_{2} O_{4}$ present, which is colourless. It undergoes dimerization at low temperatures resulting in the pairing of odd electrons.

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