A) LiF < RbF < KF < NaF
B) RbF < KF < NaF < LiF
C) LiF > NaF > KF > RbF
D) LiF < NaF < KF < RbF
Correct Answer: D
Solution :
Higher the lattice enthalpy lower will be solubility i.e., \[\text{lattice}\,\text{enthalpy}\propto \frac{\text{1}}{\text{Solubility}}\] Since the lattice enthalpy of alkali metals follow the order \[Li>Na>K>Rb\] Hence the correct order of solubility is \[LiF<NaF<KF<RbF\]
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