Question

Which of the following ionic solids has the lowest melting point?

• A. $KCl$
• B. $NaCl$
• C. $LiF$
• D. $LiCl$

Answer 1

The correct option is A $KCl$

Melting point of an ionic compound is determined by the electrostatic attraction between cations and anions. It takes a lot of energy to overcome this attraction to allow the ions to move freely and form a liquid. The factor witch effect melting point is charge of the ion. Since, $KCl$ has $+1$ and $-1$ charge on its' cations and anions respectively. Hence, it has the lowest melting point.

Hence, the correct option is $A$