Question

In the context with the transition elements, which of the following statements are incorrect?
(A) In addition to the normal oxidation states, the zero-oxidation state is also shown by these elements in complexes.
(B) In the highest oxidation state, the transition metals show basic character and form cationic complexes.
(C) In the highest oxidation state of the first five transition elements (Sc to Mn) all the 4s and 3d electrons are used for bonding.
(D) Once the ${d^5}$ configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.

Answer 1

In order to find which of the given statements about the transition element is incorrect, we must be aware about the transition elements. The d- block elements are known as the transition elements and these elements will be having partially filled d-orbitals.

Complete Solution :
Let us first learn about the transition elements and then see which of the given statements is incorrect. Transition elements can also be referred to as Transition metals. The d- block elements are also known as the transition elements because they will be having partially filled d-orbitals. Let us now see some of the general properties of the transition elements.
- The transition elements can undergo d-d transition and therefore, it can give colour to the compound or ions.
- Due to the unpaired electron in the d-orbital, a paramagnetic compound is formed.
- The transition elements are very hard.
- The melting and the boiling points of the transition elements are high because of the participation
delocalized d-electron in the metallic bonding.
- At the highest oxidation state d-block element will form anionic complex.
- The transition elements will be showing acidic nature at the highest oxidation state.
So, the correct answer is “Option B”.

Note: We have to remember that all the elements present in the d-block elements are not transition elements. Certain elements like Cadmium, mercury and Zinc are not considered as the transition elements as they are having an electronic configuration of $(n - 1){d^{10}}n{s^2}$.