Question

The incorrect statement among the following is :

• A. Lanthanoids are good conductors of heat and electricity.
• B. Actinoids are highly reactive metals, especially when finely divided.
• C. Actinoid contraction is greater for element-to-element than Lanthanoid contraction.
• D. Most of the trivalent Lanthanoid ions are colourless in the solid state.

Hint:

Color in Lanthanoids arises due to \(f-f\) transitions. Ions with completely empty, half-filled, or completely filled \(f\)-orbitals are generally colorless.

Answer 1

The Correct Option is D