Knowing that the chemistry of lanthanoids

Question:

Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ?

  1.  Ln(III) compounds are generally colourless

  2.  Ln(III) hydroxides are mainly basic in character

  3.  Because of the large size of the Ln(III) ions the bonding in its compounds is predominently

         ionic in character

  4. The ionic sizes of Ln(III) decrease in general with increasing atomic number


Correct Option: 1

Solution:

Incorrect

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