JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

1 Easy

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Assertion (A) : On cooling, the brown colour of nitrogen dioxide disappears.

Reason (R): On cooling

\mathrm{NO}_2

undergoes dimerisation resulting in the pairing of odd electrons of

\mathrm{NO}_2

View answer and explanation

Correct option: A

Both

\mathbf{A}

and

\mathbf{R}

are true and

\mathbf{R}

is the correct explanation of

\mathbf{A}

Option A is correct because cooling nitrogen dioxide causes it to dimerize, pairing its odd electrons and reducing the brown color.

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