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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Which one of the following statements concerning lanthanide elements is false ?
  • A
    Lanthanides are separated from one another by ion exchange method
  • ✓
    The ionic radii of trivalent lanthanides steadily increase with increase in atomic number
  • C
    All lanthanides are highly dense metals
  • D
    Most characteristic oxidation state of lanthanides is $+3$
✓

Answer

Correct option: B.
The ionic radii of trivalent lanthanides steadily increase with increase in atomic number
b
The ionic radii of trivalent lanthanides decreases progressively with increase in atomic number. This decrease is known as lanthanide contraction.

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