﻿ CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is : Kaysons Education

# CaO And NaCl Have The Same Crystal Structure And Approximately The Same Ionic Radii. If U Is The Lattice Energy Of NaCl, The Approximate Lattice Energy Of CaO Is

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## Question

### Solution

Correct option is

4U

Lattice energy,

Since, interionic distances in CaO and NaCl are similar, (larger cation has smaller anion and vice versa) r is almost the same. Therefore, lattice energy depends only on charge.

Since, the magnitude of charge on  ions is same ie, unity and that on  ions is 2 each, therefore, the lattice energy of CaO is four times the lattice energy of NaCl, ie, 4U.

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