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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
Which one of the following statements about lanthanides is false ?
  • A
    Lanthanides are seperated from one another by ion exchange method.
  • ✓
    The ionic radii of trivalent lanthanides steadily increases with increase in atomic number.
  • C
    All lanthanides are highly dense metals.
  • D
    Most typical oxidation state of lanthanides is $+3$
✓

Answer

Correct option: B.
The ionic radii of trivalent lanthanides steadily increases with increase in atomic number.
The ionic radii of trivalent lanthanides steadily decreases with increase in atomic number due to lanhanide contraction.

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