Lanthanoids (Ln) are well known for their +3 | vedclass

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(B) The lanthanoids exhibit a $+3$ oxidation state as their most stable state. $1$. The ionic radii of $Ln(III)$ ions decrease with an increase in ato

Vedclass · Accepted Answer

$Ln(III)$ compounds are mostly colorless.

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(B) The lanthanoids exhibit a $+3$ oxidation state as their most stable state. $1$. The ionic radii of $Ln(III)$ ions decrease with an increase in atomic number due to lanthanoid contraction. $2$. $Ln(III)$ compounds are often colored due to $f-f$ transitions,unlike the statement that they are mostly colorless. $3$. $Ln(III)$ hydroxides are basic in nature,and their basicity decreases as the ionic radius decreases. $4$. Due to the large size of $Ln(III)$ ions,they form compounds that are predominantly ionic in nature. Therefore,the statement that $Ln(III)$ compounds are mostly colorless is incorrect.

Lanthanoids $(Ln)$ are well known for their $+3$ oxidation state. Which of the following statements is $NOT$ applicable to them?

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