Q.

The following salt shows maximum covalent character

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a

AlCl3

b

MgCl2

c

CsCl

d

LaCl3

answer is A.

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Detailed Solution

According to Fajan’s rule, as the charge on cation increase its size decreases. As a result its tendency to polarise anion increases. This brings more and more covalent character to electrovalent compounds.∵  Among AlCl3,LaCl3,MgCl2  and CsCl size of Al3+  is smallest.∴ Al3+ polarises anion to highest extent.∴ AlCl3  has maximum covalent character.
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