Question

Lattice energy (numerical value) of choride of alkali metals is in order :

• A. LiCl > NaCl > KCl > RbCl > CsCl
• B. LiCl < NaCl < KCl < RbCl < CsCl
• C. NaCl < KCl < LiCl < RbCl < CsCl
• D. NaCl < KCl < RbCl < CsCl < LiCl

Answer 1

Answer: (A)

LiCl > NaCl > KCl > RbCl > CsCl

As we move down the group, size of cation increases and distance between cation-anion increases.

Also, smaller cation polarizes anion to a greater extent hence larger covalent nature and thus lattice energy is decreases down the group.

Hence,option A is correct.