Chapter 4: Materials: Metals and Non-Metals
Q1. Give two examples of metals that are soft and two that are hard.
SolutionSoft: Sodium, Potassium
Hard: Iron, Diamond (non-metal but very hard)
Q2. What happens when iron nails are placed in copper sulphate solution?
SolutionFe + CuSO₄ → FeSO₄ + Cu
Iron displaces copper because it is more reactive.