Question

Identify the CORRECT statements from the following.

(I) Both lanthanoids and transition metals show magnetism.

(II) Both lanthanoids and actinoids form oxocations.

(III) Both lanthanoids and actinoids show decrease in ionic radius with an increase in atomic number.

(IV) Both lanthanoids and transition metals show fixed geometries.

Options

• (I), (III)

• (II), (IV)

• (I), (III), (IV)

• (I), (IV)

Answer 1

(I), (III)

Explanation:

(II) Lanthanoids do not form oxocations while actinoids form oxocations.

(IV) Lanthanoids show flexibility in geometry while transition metals show fixed geometries (ligand field effects).