JEE MAIN - Chemistry (2025 - 3rd April Evening Shift - No. 23)
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).
Answer
4
Explanation
| Sc | Mn | Co | Cu | |
|---|---|---|---|---|
| Enthalpy of Atomisation (kJ/mole) | 326 | 281 | 425 | 339 |
$$\begin{aligned} &\text { Highest Co }\\ &\mathrm{Co}^{+2}=(\mathrm{Ar}) 3 \mathrm{~d}^7 \end{aligned}$$
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$$\begin{aligned} &\begin{aligned} & n=3 \\ & \mu=\sqrt{15}=3.87 \end{aligned}\\ &\text { Nearest integer }=4 \end{aligned}$$
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