Among, $\mathrm{Sc}, \mathrm{Mn}, \mathrm{Co}$ and Cu, identify the element with highest enthalpy of…

Among, $\mathrm{Sc}, \mathrm{Mn}, \mathrm{Co}$ 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 _____ BM (in nearest integer).

Solution

$\begin{array}{|l|l|l|l|l|} \hline & \text{Sc} & \text{Mn} & \text{Co} & \text{Cu} \\ \hline \begin{array}{l} \text{Enthalpy of} \\ \text{Atomisation} \\ \text{(kJ/mole)} \end{array} & 326 & 281 & 425 & 339 \\ \hline\end{array}$
Highest Co
$\mathrm{Co}^{+2}=(\mathrm{Ar}) 3 \mathrm{~d}^7$

$\begin{aligned}
& \mathrm{n}=3 \\
& \mu=\sqrt{15}=3.87
\end{aligned}$
Nearest integer $=4$

Asked in: JEE Main 2025 (03 Apr Shift 2)

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