Observe the following statements:a) The basic | vedclass

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(B) Statement $a$ is correct: As the atomic number increases in the lanthanide series,the ionic radius decreases due to lanthanide contraction. This i

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$a, c$

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(B) Statement $a$ is correct: As the atomic number increases in the lanthanide series,the ionic radius decreases due to lanthanide contraction. This increases the covalent character of the $M-OH$ bond,thereby decreasing the basic strength. Thus,the order $Ce(OH)_3 > Gd(OH)_3 > Lu(OH)_3$ is correct.Statement $b$ is incorrect: $O^{2-}$,$N^{3-}$,$F^{-}$,and $Na^{+}$ all have $10$ electrons,but the original statement listed $O^{-}$ and $Mg^{+}$,which are not isoelectronic with the others.Statement $c$ is correct: Due to lanthanide contraction,the atomic radii of $Zr$ $(160 \ pm)$ and $Hf$ $(159 \ pm)$ are approximately the same.Therefore,statements $a$ and $c$ are correct.

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