S Block Elements Question 221
Question: Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point
[AIEEE 2005]
Options:
A) LiCl
B) NaCl
C) KCl
D) RbCl
Show Answer
Answer:
Correct Answer: B
Solution:
Although lattice energy of $ LiCl $ higher than $ NaCl $ but $ LiCl $ is covalent in nature and $ NaCl $ ionic there after, the melting point decreases as we move $ NaCl $ because the lattice energy decreases as a size of alkali metal atom increases (lattice energy $ \propto $ melting point of alkali metal halide)
BETA
