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The solubility of fluorides of alkali metals in water is

Options

  1. ALiF > NaF > KF > RbF > CsF
  2. BCsF > RbF > KF > NaF > LiF
  3. CLiF > KF > NaF > CsF > RbF
  4. DCsF > KF > NaF > RbF > LiF

Correct answer

B. CsF > RbF > KF > NaF > LiF

Step-by-step solution

Lattice energy α 1 r + + r - With a small anion as F - , the lattice energy decreases more rapidly along a series of salts with increasing cation size and thus solubility increases LiF < NaF < KF < RbF < CsF

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