Question

which of the following has lowest melting point?

CaCl2, CaBr2, CaI2, CaF2

Answer 1

CaI2 is the answer which has the lowest melting point

Answer 2

Answer: Option (c) is the correct answer.

Explanation:

According to Fajan's rule, larger is the size of cation and smaller is the size of anion more will be the ionic character of the compound.

Therefore, more is the ionic character more will be the force of attraction between the cation and anion.

Hence, out of the given options $CaF_{2}$ will have highest melting point whereas $CaI_{2}$ will have the least melting point.