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Which of the following has covalent bond...

Which of the following has covalent bond ?

A

`Na_(2)S`

B

`AlCl_(3)`

C

NaH

D

`"MgCl"_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`"Al"^(3+)` cation is smaller than `"Na"^(+)` (because of greater nuclear charge). According to Fajan's rule, small cation polarise anion upto greater extent. Hence, `"Al"^(3+)` polarise `"Cl"^(-)` ions up to greater extent, therefore `"AlCl"_(3)` has covalent bond between Al and Cl-atoms.
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