Q9 / 90 · JEE Main 2024 (04 Apr Shift 2) · Chemistry

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of \(3.86 \mathrm{BM}\). The atomic number of the metal is

  • A
    26
  • B
    25
  • Correct answer
    C
    23
  • D
    22

Solution

$\begin{aligned} & { }_{22} \mathrm{Ti}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^2 \\ & { }_{23} \mathrm{~V}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^3 \\ & { }_{25} \mathrm{Mn}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^5 \\ & { }_{26} \mathrm{Fe}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^6\end{aligned}$

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

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