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Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
MCQ
Which of the following complex has five unpaired electrons?
  • ✓
    ${\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}}$
  • B
    ${\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}}$
  • C
    ${\left[\mathrm{CrCl}_3\left(\mathrm{H}_2 \mathrm{O}_3\right]\right.}$
  • D
    ${\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}}$
✓

Answer

Correct option: A.
${\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}}$
$\mathrm{Mn}^{2+}$ has $\mathrm{d}^5$ configuration, since $\mathrm{H}_2 \mathrm{O}$ is weak ligand field, so it does not causes pairing of electrons and hence it has $5$ unpaired electrons.

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