Q.

The solubility order for alkali metal fluoride in water is

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a

LiF

b

RbF< KF< NaF

c

LiF> NaF> KF>RbF

d

LiF<< NaF< KF

answer is D.

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Detailed Solution

Higher the lattice enthalpy lower will be solubility i.e., lattice enthalpy ∝1 Solubility Since the lattice enthalpy of alkali metals follow the order Li> Na> K> RbHence the correct order of solubility is LiF< NaF
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The solubility order for alkali metal fluoride in water is