Which of the following chemical reactions correctly demonstrate the inherent reducing character of d — Hydrogen Chemistry Question

💡 Solution & Explanation

In the reactions with heavy metal oxides like $CuO$ and $Fe_3O_4$, dihydrogen reduces the metal ion to its elemental state while oxidizing itself to water. In reactions with highly electropositive metals like $Na$ and $Ca$, hydrogen acts as an oxidizing agent, gaining electrons to form hydride ions ($H^-$).