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Question: Answered & Verified by Expert
Knowing that the Chemistry of lanthanoids $(\operatorname{Ln})$ is dominated by its $+3$ oxidation state, which of the following statements in incorrect?
Chemistryd and f Block ElementsJEE MainJEE Main 2009
Options:
  • A
    Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.
  • B
    The ionic sizes of Ln (III) decrease in general with increasing atomic number.
  • C
    Ln (III) compounds are generally colourless.
  • D
    Ln (III) hydroxides are mainly basic in character.
Solution:
1395 Upvotes Verified Answer
The correct answer is:
Ln (III) compounds are generally colourless.
$\mathrm{Ln}^{+3}$ compounds are mostly coloured.

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