Q. Which of the following has lowest boiling point?
A) $NaCl$
B) $CuCl$
C) $CuCl_{2}\$
D) $CsCl$
Explanation
(c)
According to Fajan’s rule, as the size of cation decreases, its polarising power increases. Hence, $Cu^{2 +}$ polarise $Cl^{-}$ ions more than $Cu^{+}.$ Therefore, $CuCl_{2}$ has more covalent character and hence, its boiling point is less.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.