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QJEEM09Chb05e: JEE Main 2009 Chemistry - Class 12 JEEM09Chb05e Solution: Knowing that the Chemistry of lanthanoids (Ln) is dominated by…

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 colourless
D Ln (III) hydroxides are mainly basic in character.

Step-by-Step Verified Solution

Most of the

L n^{3 +}

compounds except

L a^{3 +}

and

L u^{3 +}

are coloured due to the presence of

f

-electrons.