Salt S is prepared by reacting dilute sulphuric acid with copper oxide. Identify S.

Give balanced chemical equations for the preparation of the following salts:

1. Lead sulphate — from lead carbonate.
2. Sodium sulphate — using dilute sulphuric acid.
3. Copper chloride — using copper carbonate.

From the list of salts — AgCl, MgCl₂, NaHSO₄, PbCO₃
Choose the salt that most appropriately fits the description given below :
An insoluble chloride.

From — SO₂, SiO₂, Al₂O₃, MgO, CO, Na₂O — Select an oxide which dissolves in water forming an acid.