Classify each of the following, as a physical or a chemical change. Give reasons. (a) Drying of a shirt in the sun. (b) Rising of hot air over a radiator. (c) Burning of kerosene in a lantern. (d) Change in the colour of black tea on adding lemon juice to it. (e) Churning of milk cream to get butter.

Classify each of the following, as a physical or a chemical change. Gi

1.	Classify each of the following, as a physical or a chemical change. Give reasons. (a) Drying of a shirt in the sun. (b) Rising of hot air over a radiator. (c) Burning of kerosene in a lantern. (d) Change in the colour of black tea on adding lemon juice to it. (e) Churning of milk cream to get butter.
Answer» Solution :(a) It is a physical change. Moisture or water drops PRESENT on the SHIRT will evaporate or change into vapours. (b) It is a physical change. On cooling, the level of air over the radiator will fall. (c ) It is a chemical change. The hydrocarbons present in kerosene will react chemically with OXYGEN to form new products. (d) It is a chemical change. The acid present in lemon juice will react the constituents (E.g. CAFFEINE) present in black tea. (e) It is a physical change. However, butter will not change to milk so easily.