Chemical Bonding And Molecular Structure Question 45

Question: Which of the following has covalent bond [AFMC 1988; DCE 2004]

Options:

A) $ Na_2S $

B) $ AlCl_3 $

C) $ NaH $

D) $ MgCl_2 $

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Answer:

Correct Answer: B

Solution:

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 $ AlCl_3 $ has covalent bond between $ Al $ and Cl atoms.



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