Question

The low solubility of LiF and that of CsI in water are respectively due to which of the properties of the alkali metal ions?

• A. higher hydration enthalpy of Li$^+$, higher lattice enthalpy of Cs$^+$
• B. smaller hydration enthalpy of Li$^+$, higher lattice enthalpy of Cs$^+$
• C. smaller lattice enthalpy of Li$^+$, higher hydration enthalpy of Cs$^+$
• D. smaller hydration enthalpy of Li$^+$, smaller lattice enthalpy of Cs$^+$
• E. higher lattice enthalpy of Li$^+$, smaller hydration enthalpy of Cs$^+$

Hint:

Small ions → high lattice enthalpy Large ions → low hydration enthalpy Both can reduce solubility

Answer 1

Answer: (E)