Question

Which of the following are true regarding oxidation states of transition elements?

• A. d-block elements have variable oxidation state
• B. d-block elements have zero oxidation state
• C. d-block elements have only +1 oxidation state
• D. d-block elements have only +2 oxidation state

Answer 1

The correct option is A d-block elements have variable oxidation state

One notable feature of transition elements is their variety of stable oxidation states. This is made possible by the incomplete filling of d-orbitals in such a way that their oxidation states differ from each other by unity.