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

JEE Main Chemistry question

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

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

Answer: (C)

Solution

Lanthanoid(III) ions usually retain unpaired electrons in their -subshell (except and ), and - transitions impart characteristic colours to both their solid compounds and solutions. So statement (c),

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Question ID VK-147350