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  4. CaO and NaCl have the same crystal structure and nearly the same ionic radii. If 'u' is the lattice energy of NaCl, the lattice energy of CaO is very nearly

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Q. CaO and NaCl have the same crystal structure and nearly the same ionic radii. If 'u' is the lattice energy of NaCl, the lattice energy of CaO is very nearly

NTA AbhyasNTA Abhyas 2020General Principles and Processes of Isolation of Elements

Solution:

Lattice energy $ \propto \frac{\text{Product of charges on ions}}{\text{Interionic distance}}$

In CaO, the charges on cation and anion are twice the magnitude of charges on the cation and anion of NaCl. The interionic distance is the same.