CBSE 2023 · Region 4 · Set 1 · Q37

The melting points and boiling points of some ionic compounds are given below:

Compound	Melting Point (K)	Boiling Point (K)
NaCl	$\displaystyle 1074$	$\displaystyle 1686$
LiCl	$\displaystyle 887$	$\displaystyle 1600$
$\displaystyle \mathrm{CaCl}_{2}$	$\displaystyle 1045$	$\displaystyle 1900$
CaO	$\displaystyle 2850$	$\displaystyle 3120$
$\displaystyle \mathrm{MgCl}_{2}$	$\displaystyle 981$	$\displaystyle 1685$

These compounds are termed ionic because they are formed by the transfer of electrons from a metal to a non-metal. The electron transfer in such compounds is controlled by the electronic configuration of the elements involved. Every element tends to attain a completely filled valence shell of its nearest noble gas or a stable octet.

(i)

Show the electron transfer in the formation of magnesium chloride.

(ii)

List two properties of ionic compounds other than their high melting and boiling points.

(iii)

(A)OR(B)

While forming an ionic compound say sodium chloride how does sodium atom attain its stable configuration?