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)

<p>&nbsp;<span contenteditable="false"> <math> <mrow> <mi>C</mi> <msup> <mrow> <mi>o</mi> </mrow> <mrow> <mn>3</mn> <mo>+</mo> </mrow> </msup> </mrow> </math> </span><math><mrow><msup><mrow></mrow><mrow></mrow></msup></mrow></math>&nbsp;will not get oxidized, so will not liberate H2 gas upon reaction with acidic solution.</p><p><img ></p><p>No. of unpaired electron = 4</p><p>Spin only magnetic moment = <span contenteditable="false"> <math> <mrow> <mroot> <mrow> <mn>4</mn> <mrow> <mo> (</mo> <mrow> <mn>4</mn> <mo>+</mo> <mn>2</mn> </mrow> <mo>)</mo> </mrow> </mrow> <mrow></mrow> </mroot> <mi>B</mi> <mi>M</mi> <mo>=</mo> <mroot> <mrow> <mn>2</mn> <mn>4</mn> </mrow> <mrow></mrow> </mroot> <mi>B</mi> <mi>M</mi> <mo>≈</mo> <mn>5</mn> <mi>B</mi> <mi>M</mi> </mrow> </math> </span><math><mrow><mroot><mrow><mrow><mrow></mrow></mrow></mrow></mroot><mroot><mrow></mrow></mroot></mrow></math></p>

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