2g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reaction.

Q. Identify the type of chemical reaction taking place and also write the balance chemical equation for : on heating copper powder in air is china dish, a surface of copper powder turns block.

Q. What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.

Q. What change in colour is observed when white silver chloride is left exposed in sunlight? State the type of chemical reaction and also write its chemical equation.

Q. (a) When sodium is burnt in chlorine, sodium chloride is formed, and when molten sodium chloride is electrolysed, then sodium and chlorine are formed. What type of reaction takes place:
(i) in the first case?
(ii) in the second case?
(b) When hydrogen is passed over heated copper oxide, copper and steam are formed. Write a balanced chemical equation for this reaction. State which of the chemicals is oxidised and which one is reduced?
​(c) What would you observe when zinc is added to a solution of iron sulphate? Write the chemical equation of the reaction which takes place. Why does this reaction occur?

Q. (a) What is a balanced chemical equation? Why should chemical equations be balanced?
(b) Aluminium burns in chlorine to form aluminium chloride (AlCl₃). Write a balanced chemical equation for this reaction.
(c) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write a balanced chemical equation for this reaction.