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d-and f-Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryd-and f-Block Elements1 Mark
Question
Why is separation of lanthanoid elements difficult?
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Answer

The separation of lanthanoid elements is difficult because of lanthanoid contraction. Due to contraction the change in atomic and ionic radii is very small and these elements show similar chemical properties and the separation becomes difficult.

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