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 $
Show Answer
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.
