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If the size of Lanthanide ions $(M^{+ 3})$ are in the Decreasing order, then Ce, Pm, Eu, Lu respectively are

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$C e > P m > E u > L u$

$L u > E u > P m > C e$

$P m > C e > L u > E u$

$L u > C e > P m > E u$

answer is A.

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Detailed Solution

Size of $M^{3 +}$ decreases on moving left to night in Lanthonide series.

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