Among Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _____ B.M (in nearest integer). [2025]

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Solution

Q.
Among Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _____ B.M (in nearest integer). [2025]

Ans.
(4)

Element Sc Mn Co Cu

Enthalpy of atomization (kJ/mol) 326 281 425 339

Co has highest enthalpy of atomization among Sc, Mn, Co and Cu.

${Co}^{2 +} = {}_{18}{[Ar]}$ $3 d^{7}$ , Number of unpaired electrons in ${Co}^{2 +} (n)$ = 3.

Spin only magnetic moment ( $μ$ )

$μ = \sqrt{n (n + 2)} BM$

$= \sqrt{3 (3 + 2)} BM = 3.87 BM \approx 4 BM$

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