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Knowing that the chemistry of lanthanoids (Ln) is dominated by its `+3` oxidation state, which of the following statement is incorrect?
A. The ionic sezes of Ln (III) decrease in general with increasing atomic number.
B. Ln (III) compounds are generally colourless.
C. Ln (III) hydroxides are mainly basic in character
D. Becaue of the larger size of the Ln (III) ions the bonding in its compounds is predominently ionic in character.

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