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Q.

Which of the following has covalent bond

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a

Na2S

b

AlCl3

c

NaH

d

MgCl2

answer is B.

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Detailed Solution

We know that Al+3 cation is smaller than  Na+ (because of greater nuclear change) According to Fajan's  rule, small cation polarise anion up to greater extent. Hence Al+3polarise Cl− - ion up  to greater extent, therefore AlCl3 has covalent bond between Al and Cl atoms
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Which of the following has covalent bond