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in Chemical Bonding and Molecular Structure by (80.9k points)
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CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the Iattice energy of NaCl, the approximate lattice energy of CaO is

(a) U/2

(b) U

(c) 2U

(d) 4U

1 Answer

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Best answer

Correct option  (d) 4U

Explanation:

where q1 and q2 are charges on ions and r is the distance between them. Since interionic distances in CaO and NaCl are similar, (larger cation has smaller anion and vice versa) therefore, r is almost the same. Therefore, lattice energy depends only on charge. Since the magnitude of charge on Na+ and Cl- ions is unity and that on Ca2+ and Or ions is 2 each. therefore, the lattice energy of CaO is four times the lattice energy of NaCl, i.e., 4U.

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