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

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

  • Ln (III) compounds are generally colourless.

  • Because of the large size of the Ln (III) ions, the bonding in its compounds is predominantly ionic in character

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

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