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  4. The solubility order for alkali metal fluoride in water is

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Q. The solubility order for alkali metal fluoride in water is

NTA AbhyasNTA Abhyas 2022

Solution:

Higher the lattice enthalpy lower will be solubility
i.e., lattice enthalpy $ \propto \frac{1}{\text{Solubility}}$
Since the lattice enthalpy of alkali metals follow the order
$Li>Na>K>Rb$
Hence the correct order of solubility is
$LiF < NaF < KF < RbF$