Answer:
(a) Physical change because evaporation of water takes
place but no change occurs in the composition of the substance.
(b) Physical change because it is also involving only
movement of air, no change in composition of air.
(c) First physical change, when kerosene vaporises. After
that, burning of kerosene is a chemical change as new products are formed.
(d) Physical change as there occurs only the dissolution.
(e) Physical .change as there is no change in composition.
Only the separation of components takes place by the physical phenomenon,
centrifugation.
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