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  4. 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)

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Q. 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 MainJEE Main 2022The d-and f-Block Elements

Solution:

$Co ^{3+}$ can't liberate $H _2$.
It has $d ^6$ configuration,
Number of unpaired electrons $=4$
$\mu=\sqrt{4 \times 6}=4.92 \text { B.M. }$