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NEET levelSingle correct optionDifficulty 1 of 3cb166

Which of the following chlorides has the greatest covalent character?

A $CaCl X_{2}$
B $NaCl$
C $AlCl X_{3}$
D $MgCl X_{2}$

Answer: C

Covalent character rises with the charge and falls with the size of the cation (Fajans).

Al X^{3 +}

has the highest charge and the smallest radius of the cations listed, so it polarises

Cl X^{-}

most. Hence

AlCl X_{3}

is the most covalent.

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