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

Question

Knowing that the chemistry of lanthanoids (Ln) is dominated by its + 3 oxidation state, which of the following statements is incorrect? (A) The ionic size of Ln (III) decrease in general with increasing atomic number (B) Ln (III) compounds are generally colourless. (C) Ln (III) hydroxide are mainly basic in character. (D) Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character

Tardigrade Admin · Accepted Answer

Due to poor shielding effect of f subshell ionic radius of Ln +3 decreases as atomic number increases. If an element has unpaired electron then it shows colour. lanthanum are basic in nature. Their's compounds are predominantly ionic due to large size of cation.

Q. Knowing that the chemistry of lanthanoids $(L n)$ is dominated by its $+ 3$ oxidation state, which of the following statements is incorrect?

The ionic size of $L n$ (III) decrease in general with increasing atomic number

$L n$ (III) compounds are generally colourless.

$L n$ (III) hydroxide are mainly basic in character.

Because of the large size of the $L n$ (III) ions the bonding in its compounds is predominantly ionic in character

Due to poor shielding effect of $f$ subshell ionic radius of $L n^{+ 3}$ decreases as atomic number increases. If an element has unpaired electron then it shows colour. lanthanum are basic in nature. Their's compounds are predominantly ionic due to large size of cation.

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

The ionic size of Ln (III) decrease in general with increasing atomic number

Ln (III) compounds are generally colourless.

Ln (III) hydroxide are mainly basic in character.

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