Question 16Which one of the following processes involves chemical reactions?(a) Storing of oxygen gas under pressure in a gas cylinder.(b) Liquefaction of air.(c) Keeping petrol in a china dish in the open.(d) Heating copper wire in presence of air at high temperature.

Question 16Which one of the following processes involves chemical reac

1.	Question 16Which one of the following processes involves chemical reactions?(a) Storing of oxygen gas under pressure in a gas cylinder.(b) Liquefaction of air.(c) Keeping petrol in a china dish in the open.(d) Heating copper wire in presence of air at high temperature.
Answer» Question 16 Which one of the following processes involves chemical reactions? (a) Storing of oxygen gas under pressure in a gas cylinder. (b) Liquefaction of air. (c) Keeping petrol in a china dish in the open. (d) Heating copper wire in presence of air at high temperature.