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17/12/2021 12:25 pm
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The solubility order for alkali metal fluoride in water is
(a) LiF < RbF < KF < NaF
(b) RbF < KF < NaF < LiF
(c) LiF > NaF > KF > RbF
(d) LiF < NaF < KF < RbF
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17/12/2021 12:27 pm
Correct answer: (d) LiF < NaF < KF < RbF
Explanation:
Higher the lattice enthalpy lower will be solubility i.e.,
lattice enthalpy ∝ \(\frac{1}{Solubility}\)
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