Explain the following reactions giving their balanced chemical equations :
Iron is treated with dil. Hydrochloric acid.

Zinc is treated with dilute hydrochloric acid.

Explain the following reactions giving their balanced chemical equations : Steam is passed over iron.

Iron reacts with dilute hydrochloric acid.

Explain the following reactions giving their balanced chemical equations : Calcium oxide is mixed with water. Give balanced reaction.

Explain the following reactions giving their balanced chemical equations : Lead is added to copper sulphate solution.

Magnesium is treated with dilute hydrochloric acid.

Explain the following chemical reactions and write the balanced chemical equations. Sugar is heated (charred.)