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Question

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

A
The ionic sizes of Ln(III) decreases in general with increasing atomic number
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B
Ln(III) compounds are generally colourless
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C
Ln(III) hydroxides are mainly basic in character
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D
Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic character
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Solution

The correct option is B Ln(III) compounds are generally colourless
The lanthanide ions have unpaired electrons in their orbitals, thus these ions absorb visible regions of light and under go f-f transition and hence exhibit colour.
Option B is correct.

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