Chemical Bonding And Molecular Structure Question 461

Question: 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

Options:

A) U/2

B) U

C) 4C

D) 2 U

Show Answer

Answer:

Correct Answer: C

Solution:

  • $ Latticeenergy=\frac{Productofcharges}{interionicdistance} $

In $ NaCl $ the product of charges $ =1\times 1 $ ; In CaO product of charges $ =2\times 2=4 $ while the inter ionic distance is almost same in both. Thus lattice energy of CaO is almost four times the lattice energy of $ NaCl $ .



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