Question

cording to fanjan's rule and lattice energy explain Mgcl2 is lower melting point than Cacl2​

Answer 1

Answer:

Ionic character of any molecule depends on the size of cation, anion and on the charges of cation and anion.

Here, in all the cases, anion is Cl

−

. Now, consider cations Be

2+

,Mg

2+

,Ca

2+

and Ba

2+

.

The charge is +2 in all the ions.

So, if we consider the size of cations, the increasing order of size is, Be<Mg<Ca<Ba as we move down the group.

Be is smallest in size. Hence according to Fajan's rule, BeCl

2

is the least ionic out of the given chlorides.