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(D) Hydration energy is directly proportional to the charge density of the ion,which is defined as the ratio of charge to size $(Charge/Size)$.For cat

Vedclass · Accepted Answer

$Al^{+3} > Mg^{+2} > Na^{+}$

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(D) Hydration energy is directly proportional to the charge density of the ion,which is defined as the ratio of charge to size $(Charge/Size)$.For cations,as the charge increases and the size decreases,the hydration energy increases.Comparing $Al^{+3}$,$Mg^{+2}$,and $Na^{+}$: All are isoelectronic with the neon configuration,but $Al^{+3}$ has the highest charge and smallest size,followed by $Mg^{+2}$ and then $Na^{+}$.Therefore,the correct order is $Al^{+3} > Mg^{+2} > Na^{+}$.

List-$I$	List-$II$
$(a)$ $Li$	$(i)$ photoelectric cell
$(b)$ $Na$	$(ii)$ absorbent of $CO_{2}$
$(c)$ $K$	$(iii)$ coolant in fast breeder nuclear reactor
$(d)$ $Cs$	$(iv)$ treatment of cancer
	$(v)$ bearings for motor engines

Which of the following represents the correct order of hydration energy?

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