Question

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 electrons in $N{O}_2$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

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

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 electrons in $N{O}_2$
$\underset{\text{Reddish brown gas}}{2N{O}_2}\rightleftharpoons \underset{\text{Colourless solid}}{N_2{O}_4}$
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion