Question
Melting point of calcium halides decreases in the order
A.
$$Ca{F_2} > CaC{l_2} > CaB{r_2} > Ca{I_2}$$
B.
$$Ca{I_2} > CaB{r_2} > CaC{l_2} > Ca{F_2}$$
C.
$$CaB{r_2} > Ca{I_2} > Ca{F_2} > CaC{l_2}$$
D.
$$CaC{l_2} > CaB{r_2} > Ca{I_2} > Ca{F_2}$$
Answer :
$$Ca{F_2} > CaC{l_2} > CaB{r_2} > Ca{I_2}$$
Solution :
As the size of the anion increases, the covalent character increases and hence the $$m.p.$$ decrease.