Question

The correct order of hydration enthalpies of alkali metal ions is -

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

Answer 1

Answer: (A)

Hydration enthalpy depends upon ionic potential (charge / size). As ionic potential increases hydration enthalpy increases.