b (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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