The most basic among these hydroxides is:

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(D) The basicity of metal hydroxides increases as we move down the group in the periodic table due to the increase in metallic character and the decre

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$Ba(OH)_2$

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(D) The basicity of metal hydroxides increases as we move down the group in the periodic table due to the increase in metallic character and the decrease in ionization energy. Since $Be, Mg, Ca,$ and $Ba$ belong to Group $2$ (alkaline earth metals),the order of basicity is $Be(OH)_2 Therefore,$Ba(OH)_2$ is the most basic hydroxide among the given options.

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