The spin-only magnetic moment value of M³+ ion (in gaseous state) from the pairs Cr³⁺/Cr²⁺, Mn³⁺/Mn²⁺, Fe³⁺/Fe²⁺ and Co³⁺/Co²⁺ that has negative standard electrode potential, is________ B.M [Nearest integer]

<p>In given electrodes, only&nbsp;<math><mrow><msubsup><mrow><mi>E</mi></mrow><mrow><mi>C</mi><msup><mrow><mi>r</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>/</mo><mi>C</mi><msup><mrow><mi>r</mi></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></mrow><mrow><mn>0</mn></mrow></msubsup></mrow></math>&nbsp;is negative</p><p>Cr (24) – [Ar] 4s¹3d⁵4p⁰</p><p>Number of unpaired electrons = 3</p><p><span contenteditable="false"> <math> <mrow> <mi>μ</mi> <mo>=</mo> <mroot> <mrow> <mi>n</mi> <mrow> <mo> (</mo> <mrow> <mi>n</mi> <mo>+</mo> <mn>2</mn> </mrow> <mo>)</mo> </mrow> </mrow> <mrow></mrow> </mroot> <mi>B</mi> <mi>M</mi> <mo>=</mo> <mroot> <mrow> <mn>3</mn> <mrow> <mo> (</mo> <mrow> <mn>3</mn> <mo>+</mo> <mn>2</mn> </mrow> <mo>)</mo> </mrow> </mrow> <mrow></mrow> </mroot> <mi>B</mi> <mi>M</mi> <mo>=</mo> <mn>3</mn> <mo>.</mo> <mn>9</mn> <mn>7</mn> <mi>B</mi> <mi>M</mi> <mo>≈</mo> <mi>θ</mi> <mn>4</mn> <mi>B</mi> <mi>M</mi> </mrow> </math> </span></p><p>&nbsp;</p>

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