Question

Assertion: Actinoids form relatively less stable complexes as compared to lanthanoids.

Reason: Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.

विकल्प

• Both assertion and reason are true, and reason is the correct explanation of the assertion.

• Both assertion and reason are true but reason is not the correct explanation of assertion.

• Assertion is not true but reason is true.

• Both assertion and reason are false.

Answer 1

Assertion is not true but reason is true.

Explanation:

Actinoids are more reactive than lanthanoids as they involve their 5d-orbital in the bond formation process while due to effectively shielded and greater nuclear charge 4f-orbitals are not available for bonding. Thus, lanthanoids comparatively form less complexes than actinoids. 

Assertion is not true but reason is true.