Which of the following has covalent bond?

N a_{2} S

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A l C l_{3}

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N a H

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M g C l_{2}

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Solution

The correct option is B $A l C l_{3}$
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 , therefore $A l C l_{3}$ has covalent bond between Al and Cl atom.

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A l F_{3}

A l C l_{3}

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N a C l, M g C l_{2}, A l C l_{3}

N a C l, M g {C l}_{2}, A l {C l}_{3}

A l {C l}_{3} < M g {C l}_{2} < N a C l

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