Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation agent, and

(i) Oxidising agent

(ii) reducing agent, in this reaction.

29 (a) What is the colour of ferrous sulphate crystals? How does this colour change after heating?

(b) Name the product formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change?

30 What is a decomposition reaction? Give an example of a decomposition reaction. Describe an activity to illustrate such a reaction by heating. 32 Give one example of a oxidation -reduction reaction which is also:

(a) a combination reaction

(b) a displacement reaction

33 What is the difference between displacement and double displacement reactions ? Write equations for these reactions.