The most acidic compound in water is

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(C) Among the given compounds,ferric chloride $(FeCl_3)$ is the most acidic in water.This is due to the higher charge density and effective nuclear ch

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$FeCl_3$

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(C) Among the given compounds,ferric chloride $(FeCl_3)$ is the most acidic in water.This is due to the higher charge density and effective nuclear charge of the $Fe^{3+}$ ion compared to $Al^{3+}$ and $Be^{2+}$.As the charge density of the central metal cation increases,its ability to polarize the $O-H$ bond in coordinated water molecules increases,leading to greater acidity.All these compounds undergo hydrolysis in water to liberate $HCl$ gas:$BeCl_2 + 2 H_2O \rightarrow Be(OH)_2 + 2 HCl \uparrow$$AlCl_3 + 3 H_2O \rightarrow Al(OH)_3 + 3 HCl \uparrow$$FeCl_3 + 3 H_2O \rightarrow Fe(OH)_3 + 3 HCl \uparrow$$Fe^{3+}$ has a higher charge-to-size ratio,making it the strongest Lewis acid among the choices.

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