Which of the following compounds is the most | vedclass

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(D) In the lanthanoid series,the ionic radius decreases from left to right due to lanthanoid contraction. As the ionic radius decreases,the covalent c

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$Er(OH)_3$

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(D) In the lanthanoid series,the ionic radius decreases from left to right due to lanthanoid contraction. As the ionic radius decreases,the covalent character of the $M-OH$ bond increases,which leads to an increase in the acidic nature of the hydroxides. Therefore,the acidity increases as we move from $Pr$ to $Er$ in the periodic table. Among the given options,$Er(OH)_3$ is the most acidic.

Which of the following compounds is the most acidic?

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