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STD 12 - 5. Co-ordination chemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 5. Co-ordination chemistry4 Marks
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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