Among Co3+, Ti2+, V2+ and Cr2+ ions, one if used as a reagent cannot liberate H2 from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is ……B.M. (Nearest integer)

Co3+ can’t liberate H2.It has d6 configuration,Number of unpaired electrons = 4μ=4×6=4.92 B.M.

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Among Co³⁺, Ti²⁺, V²⁺ and Cr²⁺ions, one if used as a reagent cannot liberate H₂ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is ……B.M. (Nearest integer)

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Co³⁺ can’t liberate H₂.

It has d⁶ configuration,

Number of unpaired electrons = 4

$μ = \sqrt{4 \times 6} = 4 .92 B.M.$

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