Which of the following complexes of $Co^{3+}$ shows more than one type of isomerism?

  • A
    $[Co(en)_3]^{3+}$
  • B
    $[Co(NH_2CH_2CH_2S)_3]^0$
  • C
    $[Co(C_2O_4)(en)_2]^{+}$
  • D
    $[Co(EDTA)]^{-}$

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How many geometrical isomers are possible for the square planar complex $[Pt(NH_3)(Br)(Cl)(Py)]^{2+}$?

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The correct order of the spin-only magnetic moments of the following complexes is
$(I) [Cr(H_2O)_6]Br_2$
$(II) Na_4[Fe(CN)_6]$
$(III) Na_3[Fe(C_2O_4)_3] (\Delta_0 > P)$
$(IV) (Et_4N)_2[CoCl_4]$

The pair of metal ions that can give a spin-only magnetic moment of $3.9 \, BM$ for the complex $[M(H_2O)_6]Cl_2$ is

Match the following:
List-$I$ (Complex) List-$II$ (Spin only Magnetic moment)
$A$. $[CoF_6]^{3-}$ $I$. $0$
$B$. $[Co(C_2O_4)_3]^{3-}$ $II$. $\sqrt{24}$
$C$. $[FeF_6]^{3-}$ $III$. $\sqrt{8}$
$D$. $[Mn(CN)_6]^{3-}$ $IV$. $\sqrt{35}$
$V$. $\sqrt{15}$

Which one of the following is expected to exhibit optical isomerism $(en = \text{ethylenediamine})$?

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