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JIPMER 2010
Exam
JIPMER
Year
2010
Subject
Chemistry
Chapter
Coordination Compounds

JIPMER 2010 · Chemistry · Coordination Compounds

The complex ion which has no d -electrons in the central metal atom...

The complex ion which has no dd-electrons in the central metal atom is

Options

  1. A[MnO4]−\left[\mathrm{MnO}_4\right]^{-}
  2. B\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}
  3. C[Fe(CN)6]3−\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}
  4. D\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}

Correct answer

A. [MnO4]−\left[\mathrm{MnO}_4\right]^{-}

Step-by-step solution

In [MnO4]−\left[\mathrm{MnO}_4\right]^{-}, the oxidation state of Mn is +7 . Mn(25)=[Ar]3d54s2Mn7+=[Ar]\begin{aligned} \mathrm{Mn}(25) & =[\mathrm{Ar}] 3 d^5 4 s^2 \\ \mathrm{Mn}^{7+} & =[\mathrm{Ar}] \end{aligned} Thus, in [MnO4]−\left[\mathrm{MnO}_4\right]^{-}no dd-electron is present.
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