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1. A fractured bone is fixed with a paste made of Plaster of Paris (POP). It is a powdery substance which is used as a coating over the bandage on the fractured bone. After a few hours, the POP becomes hard and dry.
This change occurred in POP cannot be changed to its original powder form because it is a/an
This change occurred in POP cannot be changed to its original powder form because it is a/an
2. Neha was boiling water in a pan. Her sister Rhea observed that some bubbles are formed during boiling of water. Neha told Rhea that boiling of water is a chemical change as gas is evolved. But Rhea argued that it is not a chemical change. What kind of change is this?
3. 
The phase change between liquid to solid on cooling is known as
Reference:
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