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D and F Block Elements question

2021 · Q91
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D and F Block Elements question

2021 · Q91

NEETChemistryD and F Block ElementsMCQ+4 / −1
The incorrect statement among the following is :
  1. A
    Actinoids are highly reactive metals, especially when finely divided.
  2. B
    Actinoid contraction is greater for element to element than lanthanoid contraction.
  3. C
    Most of the trivalent Lanthanoid ions are colorless in the solid state.
  4. D
    Lanthanoids are good conductors of heat and electricity.
View written solutionFree

Correct answer: C

∙\bullet∙ The surface area increases when actinoids are finely divided which results in exposure of more reactant molecules to react. Hence, rate increases and so, actinoids are highly reactive metals when finely divided.

∙\bullet∙ The shielding effect of 5f-orbitals in actinoids is poor than the shielding effect of4f-orbitals. So, the effective nuclear charge on valence electrons is more in actinoids. Hence, actinoid contraction is greater than lanthanoid contraction.

∙\bullet∙ Trivalent lanthanoid ions are coloured in the solid state due to presence of f-electrons.

∙\bullet∙ Lanthanoids are inner transition metals. So, they are good conductors of heat and electricity.

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