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Question

Knowing that the 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) decrease 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 in character.

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Solution

The correct option is D

Ln (III) compounds are generally colourless.


Lanthanoid compounds are coloured.


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