NEET 2019 Odisha · ChemistryMO theoryPrevious Year Question

Which of the following is paramagnetic?

Answer: (D) $O X_{2}$ . \textbf{Answer:} (D) $O X_{2}$ \textbf{Solution:} By molecular orbital theory, $O X_{2}$ has two unpaired electrons in its degenerate $π^{*} 2 p$ antibonding orbitals, making it paramagnetic; $N X_{2}$ , $H X_{2}$ and $Li X_{2}$ have all electrons paired (diamagnetic).

A. $N X_{2}$
B. $H X_{2}$
C. $Li X_{2}$
D. $O X_{2}$ ✓

Correct Answer

(D) $O X_{2}$

Solution & Explanation

\textbf{Answer:} (D) $O X_{2}$ \textbf{Solution:} By molecular orbital theory, $O X_{2}$ has two unpaired electrons in its degenerate $π^{*} 2 p$ antibonding orbitals, making it paramagnetic; $N X_{2}$ , $H X_{2}$ and $Li X_{2}$ have all electrons paired (diamagnetic).

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