Which of the following pairs involves isoelectronic ions

  • A

    $M{n^{ + 3 }}$and $F{e^{+ 2}}$

  • B

    $M{n^{ + 2}}$ and $F{e^{ + 3 }}$

  • C

    $C{r^{+ 3 }}$ and $F{e^{ + 2}}$

  • D

    $F{e^{+  2}}$ and $C{o^{+ 2}}$

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The 'spin only' magnetic moment value of $\mathrm{MO}_4{ }^{2-}$ is . . . . . BM. (Where $\mathrm{M}$ is a metal having least metallic radii. among $\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Zn}$ ).

(Given atomic number: $\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{~V}=23$, $\mathrm{Cr}=24, \mathrm{Mn}=25$ and $\mathrm{Zn}=30)$

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