Which of the following $3\mathrm{d}$-metal ion will give the lowest enthalpy of hydration $\left(\Delta_{\text {hyd }} \mathrm{H}\right)$ when dissolved in water ?

Question

$\mathrm{Cr}^{2+}$

$\operatorname{Mn}^{2+}$

$\mathrm{Fe}^{2+}$

$\mathrm{Co}^{2+}$

Solution

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