Question

Which of the following statement is wrong regarding Lanthanoids ?

• A. $Ln(III)$ compounds are generally colourless.
• B. $Ln(III)$ compounds are predominantly ionic in character
• C. The ionic size of $Ln(III)$ ions decreases with increasing atomic number.
• D. $Ln(III)$ hydroxides are mainly basic in nature.

Answer 1

Answer: (A)

Because of the large size of the Ln(III) ions the bonding in its compounds is predominantly ionic in character.

Ln(III) compounds are generally colourfull.

Ln III hydroxides are mainly basic in nature.

The ionic size of Ln (III) ions decreases with increasing atomic number