Q30 / 160 · TS EAMCET 2024 (10 May Shift 1) · Chemistry

In which of the following ions the spin only magnetic moment is lowest?

  • Correct answer
    A
    $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
  • B
    $\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
  • C
    $\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
  • D
    $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$

Solution

$\left[\mathrm{Ti} .\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \quad$ unpaired $\mathrm{e}^{-}$ \begin{array}{ll}\mathrm{T1}^{+3}[18 \mathrm{Ar}] 3 \mathrm{~d}^1 4 \mathrm{~s}^0 & 1 \\\mathrm{Mn}^{2+}[\mathrm{Ar}] 3 \mathrm{~d}^5 4 \mathrm{~s}^0 & 5 \\\mathrm{Ni}^{+2}[\mathrm{Ar}] 3 \mathrm{~d}^8 4 \mathrm{~s}^0 & 2 \\\mathrm{Co}^{2+}[\mathrm{Ar}] 3 \mathrm{~d}^7 4 \mathrm{~s}^0 & 3\end{array} $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ have lowest unpaired electron thus lowest magnetic moment.

Hence, the correct answer is option: 'A'.

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