Which of the following has covalent bond - Vidyadip

MCQ

Which of the following has covalent bond

A
$N{a_2}S$
✓
$AlC{l_3}$
C
$NaH$
D
$MgC{l_2}$

✓

Answer

Correct option: B.

$AlC{l_3}$

(b) We know that $A{l^{ + 3}}$ cation is smaller than $N{a^ + }$ (because of greater nuclear change) According to Fajan's rule, small cation polarise anion upto greater extent. Hence $A{l^{3 + }}$ polarise $C{l^ - }$ ion upto greater extent, therefore $AlC{l_3}$ has covalent bond between $Al$ and $Cl$ atoms.

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