Chemistry
Grade-9
Easy

Question

Which of the compounds shows the highest lattice energy?

  1. NaCl
  2. KCl
  3. RbCl
  4. CsCl

hintHint:

Lattice energy is directly proportional to the charge.
Lattice energy is inversely proportional to the distance of separation.

The correct answer is: NaCl


    • Lattice energy is the energy required to completely separate a mole of a solid ionic compound completely in its gaseous ions.
    • Lattice energy is directly proportional to charge. The larger the charge larger is lattice energy.
    • Lattice energy is inversely proportional to the charge separation. Smaller the separation larger the lattice energy.
    • Here all the compounds are mono-ionic, hence it depends on the charge separation only.
    • NaCl has the lowest bond length and highest lattice energy. 

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