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Question: Answered & Verified by Expert
Which of the following statement is wrong regarding lanthanoids?
ChemistryStructure of AtomKCETKCET 2017
Options:
  • A Ln(III) compounds are generallycolourless.
  • B Ln(III) compounds are predominantly ionicin character.
  • C The ionic size of \( \operatorname{Ln}( \) III \( ) \) ions decreaseswith increasing atomic number.
  • D \( \operatorname{Ln}( \) III \( ) \) hydroxides are mainly basic in nature
Solution:
1840 Upvotes Verified Answer
The correct answer is: Ln(III) compounds are generallycolourless.
Ln(III) ions are colored due to the presence of partly filled orbitals as a result it is possible to absorb certain
wavelengthfrom the visible region of the spectrum. Therefore, \( \operatorname{Ln}(I \mid I) \) compounds are generally colorless is a wrong
statement regarding lanthanoids.

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