Which one of the following processes involve 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 the presence of air at high temperature.
Answer:D
Which one of the following processes involve 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 the presence of air at high temperature.