JEE Main & Advanced JEE Main Paper (Held On 22 April 2013)

  • question_answer The solubility order for alkali metal fluoride in water is:     JEE Main  Online Paper (Held On 22 April 2013)

    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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