A) \[N{{a}_{2}}S\]
B) \[AlC{{l}_{3}}\]
C) \[NaH\]
D) \[MgC{{l}_{2}}\]
Correct Answer: B
Solution :
We know that \[A{{l}^{3+}}\] cation is smaller than \[N{{a}^{+}}\] (because of greater nuclear charge). According to Fajans rule, small cation polarise anion up to greater extent. Hence, \[A{{l}^{3+}}\] polarised ions \[C{{l}^{-}}\]up to greater extent, therefore \[AlC{{l}_{3}}\] has covalent bond between \[Al\] and \[Cl\]-atoms.
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