Question

give one example of each case​

Answer 1

Explanation:

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The baking of clay pot in an oven is an irreversible change. This is because the baked clay pot cannot be changed back into the original clay. Question 17: Conversion of ice into water and water into ice is an example of change which can be reversed.

2)

Change which occurs on mixing two substances, but can be reversed: Formation of salt solution. (e) Change which occurs on mixing two substances, but cannot be reversed:Mixing of cement and water.

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Answer 2

Answer:

a) The softening of iron on heating to red hot stage is a reversible change. And when the hot iron is cooled, it becomes hard again.

b) Mixing of cement and water.

Explanation:

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