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(A) As we move from $Ce$ to $Lu$ in the lanthanoid series,the atomic and ionic radii decrease due to lanthanoid contraction.$Z_{eff}$ increases,which

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Basic nature of oxide

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(A) As we move from $Ce$ to $Lu$ in the lanthanoid series,the atomic and ionic radii decrease due to lanthanoid contraction.$Z_{eff}$ increases,which leads to a decrease in the size of the ions.Due to the decrease in size,the polarizing power of the ions increases,which increases the covalent character of halides.As the size decreases,the ionic character of the oxides decreases,meaning the basic nature of the oxides decreases.Therefore,the basic nature of oxides decreases from $Ce$ to $Lu$.

Which of the following properties decreases on moving from $Ce$ to $Lu$?

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