Question

Arrange the following in increasing order of covalent character NaCl, $MgCl_{2},AlCl_{3}$

• A. $NaCl < MgCl_{2} < AlCl_{3}$
• B. $MgCl_{2} < NaCl < AlCl_{3}$
• C. $AlCl_{3} < MgCl_{2} < NaCl$
• D. $NaCl < AlCl_{3} < MgCl_{2}$

Answer 1

Answer: (A)

$NaCl < MgCl_{2} < AlCl_{3}$

Answer 2

: Cation size is decreasing in the order :

$Na^{+} > Mg^{2 +} > Al^{3 +}$

$Al^{3 +}$has maximum polarization effect and $Na^{+}$has minimum polarization effect.

The covalent nature is in the order:

$AlCl_{3} > MgCl_{2} > NaCl$