MHT CET Chemistry question

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 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 colourlessCorrect
(D)Ln (III) hydroxide are mainly basic in character

Answer: (C)

Solution

Statements (a), (b) and (d) are correct, but many Ln(III) ions with partly filled 4f subshells are coloured (f-f

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Question ID VK-074849