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 $ .
