Question

The correct order for the hydration energy of $L{i}^{+}$, $N{a}^{+}$ and $C{s}^{+}$ is:

• A. $L{i}^{+}$>$N{a}^{+}$ >$C{s}^{+}$
• B. $L{i}^{+}$<$N{a}^{+}$ <$C{s}^{+}$
• C. $N{a}^{+}$>$L{i}^{+}$ >$C{s}^{+}$
• D. $N{a}^{+}$<$L{i}^{+}$ <$C{s}^{+}$

Answer 1

The correct option is A $L{i}^{+}$>$N{a}^{+}$ >$C{s}^{+}$

Higher the charge density higher will be the hydration energy.
Since $L{i}^{+}$, $N{a}^{+}$ and $C{s}^{+}$ have unit positive charge and the order of ionic radii is $L{i}^{+}$<$N{a}^{+}$ <$C{s}^{+}$, the order of charge density and the order of hydration energy will be $L{i}^{+}$>$N{a}^{+}$ >$C{s}^{+}$