V. Answer the following questions :1. A sharpener loses its sharpening power, if used continuously. Is the loss of sharpeningpower a reversible change or an irreversible change?2. Is ironing of clothes an irreversible change? Give a reason for your answer,3. Is converting wood into saw dust a reversible change? Give one reason for your answer4. State three ways by which a change can be brought about5. Differentiate between a reversible and an irreversible change,6. How the expansion of metals, which is a reversible change, put to good user Support youranswer by an example.7. How does the solubility of a substance change with :(a) rise in temperature(b) fall in temperature?8. Why is it difficult to dissolve sugar in ice cold water?9. You have accidently dropped a glass tumbler, which breaks. Is the change reversible? Givereason.10. Give four examples of the change which :(a) cannot be reversed(b) can be reversed.11. A thick coating of plaster of Paris paste is applied on a bandage on a fractured bone. Thepaste becomes hard on drying. Can this change be reversed?12. You have boiled some milk on a hot summer day. On cooling it you forgot to place it inthe fridge. What kind of change will take place in the milk after 12 hours and why?