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Question: Answered & Verified by Expert
Knowing that the chemistry of lanthanoids $(\mathrm{Ln}$ ) is dominated by its $+3$ oxidation state, which of the following statements is incorrect?
Chemistryd and f Block ElementsVITEEEVITEEE 2017
Options:
  • A The ionic size of Ln (III) decrease in general with increasing atomic number
  • B Ln (III) compounds are generally colourless.
  • C Ln (III) hydroxide are mainly basic in character.
  • D Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.
Solution:
2300 Upvotes Verified Answer
The correct answer is: Ln (III) compounds are generally colourless.
Most of the $\mathrm{Ln}^{3+}$ compounds except $\mathrm{La}^{3+}$ and $\mathrm{Lu}^{3+}$ are coloured due to the presence of $f$-electrons.

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