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  4. Which of the following compounds will have the largest lattice energy?

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Q. Which of the following compounds will have the largest lattice energy?

NTA AbhyasNTA Abhyas 2022

Solution:

Lattice energy $ \propto \frac{q_{1} q_{2}}{d^{2}}$
$AlBr_{3}=5361\,kJ/mol;MgBr_{2}=2440\,kJ/mol$
$CaO=3401\,kJ/mol; LiBr=807\,kJ/mol.$
Hence, $AlBr_{3}$ have the largest lattice energy.