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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
The incorrect statement among the following is :
  • A
    Actinoid contraction is greater for element to element than Lanthanoid contraction.
  • ✓
    Most of the trivalent Lanthanoid ions are colorless in the solid state.
  • C
    Lanthanoids are good conductors of heat and electricity.
  • D
    Actinoids are highly reactive metals, especially when finely divided.
✓

Answer

Correct option: B.
Most of the trivalent Lanthanoid ions are colorless in the solid state.
b
Fact

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