Question

(i) When a chemical change takes
place in matter, we commonly say a
reaction takes place.
[physical/chemical]
(ii) When copper sulphide is treated
with hydrochloric acid, it gives a
smelling gas hydrogen
sulphide.
[fine/foul]
(iii) Potassium iodide solution reacts with
lead acetate solution to form potassium
acetate solution and
precipitate of lead iodide. [green/yellow]​

Answer 1

Answer:

chemical

Explanation:

because we add chemical in the matter

Answer 2

Because we add chemical