Question

Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are ??

Answer 1

elements which generally exhibit multiple oxidation states and whose ions are usually coloured are TRANSITION ELEMENT.

Answer 2

Answer: These elements are called as transition elements.

Explanation:

Transition elements are the elements which lie between s and p block elements. The valence electrons of these elements enter d-orbital. Their general electronic configuration is:  $(n-1)d^{1-10}ns^{0-2}$ where n is the outermost shell.

These elements show variable oxidation state because their valence electrons in two different sets of orbitals, that is (n-1)d and ns. as, the difference in energy of these orbitals is very little, so both the energy levels can be used for bond formation. Thus, these elements have variable oxidation states.

Most of the transition metal compounds are colored due to the presence of incomplete d-subshell. The transition of electrons result in the colored ions.

Hence, these elements are called as transition elements.