Select Paramagnetic molecule (A) , , KO_2 (B) , , cis -[Co(en)_2C… - Vidyadip

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.

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