Among $Co ^{3+}, Ti ^{2+}, V ^{2+}$ and $Cr ^{2+}$ ions, one if used as a reagent cannot liberate $H _{2}$ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is $......B.M$. (Nearest integer)

  • [JEE MAIN 2022]
  • A

    $6$

  • B

    $5$

  • C

    $3$

  • D

    $4$

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  • [AIIMS 1997]