MCQ
Select Paramagnetic molecule
$(A)\,\, KO_2$
$(B)\,\,$ cis $-[Co(en)_2Cl_2]^+$
$(C)\,\, K_3[Co(Ox)_3]$
$(D)\,\,[CoCl_3]^{2-}$
- A$A, B, C$
- ✓$A, D$
- C$B, C, D$
- D$A, C, D$
✓
Answer
Correct option: B.
$A, D$
b
$K O_{2}$ is a paramagnetic molecule as it is a superoxide having $O_{2}^{-}$ ion. In (b) \&
(c), $C o^{3+}$ is present containing $6 d$ electrons. However all these electrons are
paired up due to presence of strong field ligands. $(d)$ has $C o^{2+}$ ions with $7 d$ electrons, out of which 3 are unpaired due to presence of weak field ligand $C l$. Hence $K O_{2}$ and $\left[ CoCl _{3}\right]^{2-}$ are paramagnetic molecules.
$K O_{2}$ is a paramagnetic molecule as it is a superoxide having $O_{2}^{-}$ ion. In (b) \&
(c), $C o^{3+}$ is present containing $6 d$ electrons. However all these electrons are
paired up due to presence of strong field ligands. $(d)$ has $C o^{2+}$ ions with $7 d$ electrons, out of which 3 are unpaired due to presence of weak field ligand $C l$. Hence $K O_{2}$ and $\left[ CoCl _{3}\right]^{2-}$ are paramagnetic molecules.
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