Question

For two ionic solids, $CaO$ and $KI$, identify the wrong statement among the following.

• A. Lattice energy of $CaO$ is much larger than that of $KI$.
• B. $KI$ is soluble in benzene.
• C. $CaO$ has higher melting point.
• D. $KI$ has lower melting point.

Answer 1

Answer: (B)

$KI$ is soluble in benzene.

$KI$ is an ionic compound (polar compound), so, it won't be soluble in a non-polar solvent. Lattice energy is directly proportional to the product of charge and $CaO$ has more charge compared to $KI$. Lattice energy leads to a high melting point.