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MHT CET202523 Apr 2025Morning ShiftChemistryChemical Bonding and Molecular StructureActual

Which of the following compounds has high lattice enthalpy?

Options

  1. ALiCl
  2. BNaCl
  3. CBeF ₂
  4. DCaCl ₂

Correct answer

C. BeF ₂

Step-by-step solution

Lattice enthalpy depends on ionic charge magnitude and the sum of ionic radii, quantified by the relation Lattice Enthalpy |q₁ q₂| r_+ + r_- . Among LiCl, NaCl, BeF₂ , and CaCl₂ , compounds with doubly charged cations (Be ²⁺ or Ca ²⁺ ) exhibit higher lattice enthalpy due to increased charge product. BeF₂ and CaCl₂ both have charge product |(+2) (-1)| = 2 , whereas LiCl and NaCl have charge product 1 . Be ²⁺ ( 27 pm) is smaller than Ca ²⁺ ( 100 pm), and F ^- ( 133 pm) is smaller than Cl ^- ( 181 pm), resulting in a

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