Q. Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?
A) $RbCl$
B) $KCl$
C) $NaCl$
D) $LiCl$
Explanation
(c)
As we go down in the group, ionic character increases hence, melting point of halides should increase but NaCl has the highest melting point $(800℃)$ due to its high lattice energy.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.