Question

What happens when a piece of

1. zinc metal is added to copper sulphate solution?
2. aluminium metal is added to dilute hydrochloric acid?
3.  silver metal is added to copper sulphate solution?

Also write the balanced chemical equation if the reaction occurs.

Answer 1

1. Metal zinc displaces hydrogen component on reacting with dilute sulphuric acid (H₂SO₄) as H₂ gas which is evolved
   `"Zn"("s") + "H"_2"SO"_2("aq") -> "ZnSO"_4("aq") + "H"_2("g")`
2. Ammonia and hydrogen chloride gas. When vapours of ammonia and hydrogen chloride gas are mixed, the compound formed is ammonium chloride. It is a white solid.
   `"NH"_3("g") + "HCl"("g") -> "NH"_4"Cl"("s")`
3. Copper displaces silver from the aqueous solution of silver nitrate.
   `"Cu"("s") + 2"AgNO"_3("aq") -> "Cu"("NO"_3)_2("aq") + 2"Ag"("s")`