Question

Assertion :Nitric oxide is para magnetic while $N_{2}O$ is diamagnetic. Reason: Nitrogen exhibits variable valency in $NO$ and $N_{2}O$.

• 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 D Assertion is incorrect but Reason is correct

Nitric oxide $\left(NO\right)$. It has $15$ electrons, i.e odd number of electrons. If we fill $2$ electrons in each molecular orbital, then one electron remain in one molecular orbital lonely. This causes paramagnetic nature and it is paramagnetic.

In case of $N_{2}O$, it has $22$ electrons. So, even number of electrons. If we fill in the same way, no orbital has lonely filled electron. So it shows diamagnetism.

Valency of oxygen is ${}^{\prime }-2^{\prime }$. So valency of Nitrogen in $NO$ is $+2$ and in $N_{2}O$ is $+1$. But reason is not correct explanation to assertion.