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 upto greater extent. Hence,\[A{{l}^{3+}}\]polarise\[C{{l}^{-}}\]ions upto greater extent, therefore,\[AlC{{l}_{3}}\]has covalent bond between\[Al\]and\[Cl-\]atoms.
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