WAEC Chemistry 2024 Paper

Concept:Transition elements are metals with partially filled $\mathrm{d}$-orbitals.Explanation:These elements show typical metallic behaviour, but they also display special features.One of their key characteristics is the ability to exhibit multiple oxidation states.This happens because their $\mathrm{d}$ and $\mathrm{s}$ electrons can take part in bonding.They often form coloured salts, act as catalysts, and form complex ions.They are not necessarily very reactive, nor do they generally have low melting points.Thus, the statement that correctly describes transition elements is that they possess variable oxidation state.Answer:C. possess variable oxidation state