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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
s Block Elements

NTA Abhyas 2020 · Chemistry · s Block Elements

The solubility order for alkali metal fluoride in water is

The solubility order for alkali metal fluoride in water is

Options

  1. ALiF<RbF<KF<NaFLiF < RbF < KF < NaF
  2. BRbF<KF<NaF<LiFRbF < KF < NaF < LiF
  3. CLiF>NaF>KF>RbFLiF > NaF > KF > RbF
  4. DLiF<NaF<KF<RbFLiF < NaF < KF < RbF

Correct answer

D. LiF<NaF<KF<RbFLiF < NaF < KF < RbF

Step-by-step solution

Higher the lattice enthalpy lower will be solubility

i.e., lattice enthalpy ∝1Solubility∝ \dfrac{1}{\text{Solubility}}

Since the lattice enthalpy of alkali metals follow the order

Li>Na>K>RbLi > Na > K > Rb

Hence the correct order of solubility is

LiF<NaF<KF<RbFLiF < NaF < KF < RbF
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