Properties and Uses of Calcium Oxide

Q. Which of the following substances can be used for drying gas

1. Calcium carbonate
2. Sodium bicarbonate
3. Sodium Carbonate
4. Calcium oxide

Q. In the reduction of copper oxide (II) by heating with carbon. how many tons of carbon is needed to make 16 tons of copper

Q. 1.a)Write the equation in the ionic form : CuSO4 (aq) + Fe (s) -----> FeSO4 (aq) + Cu (s)
b) Divide the above equation into oxidation and reduction half reactions