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KCET2017ChemistryStructure of Atom

Which of the following statement is wrong regarding lanthanoids?

Options

  1. ALn(III) compounds are generallycolourless.
  2. BLn(III) compounds are predominantly ionicin character.
  3. CThe ionic size of ( Ln ( ) III ( ) ) ions decreaseswith increasing atomic number.
  4. D( Ln ( ) III ( ) ) hydroxides are mainly basic in nature

Correct answer

A. Ln(III) compounds are generallycolourless.

Step-by-step solution

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, ( Ln (I I) ) compounds are generally colorless is a wrong statement regarding lanthanoids.

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