KCET 2025 Chemistry Paper

The Lanthanoid series element known for exhibiting a +4 oxidation state is Cerium.
The electronic configuration of Cerium ( Ce ) is:
Ce:[Xe]4f15d16 s2
When Cerium is in the +4 oxidation state (Ce+4), it has the electronic configuration:
Ce+4:[Xe]4f05d06 s0
In this state, Cerium has a stable noble gas configuration, which is why it is well-known to exhibit a +4 oxidation state.