Displacement reactions also play a key role in extracting metals

 ‘‘Displacement reactions also play a key role in extracting metals in the middle of the reactivity series.’’ Justify this statement with two examples. 

• Answer:

  $$ 3\,\text{MnO}_{2}(s) + 4\,\text{Al}(s) \;\longrightarrow\; 3\,\text{Mn}(\ell) + 2\,\text{Al}_{2}\text{O}_{3}(s) + \text{heat} $$

  $$\text{Fe}_{2}\text{O}_{3}(s) + 2\,\text{Al}(s) \;\longrightarrow\; 2\,\text{Fe}(\ell) + \text{Al}_{2}\text{O}_{3}(s) + \text{heat} $$

• Exam Year: 2025