1. Give one example of this kind of case
(a) Change which occurs on heating and can be reversed.

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Solution

A change that can be reversed and can get back to its original state is called a reversible change.
An example of a change which occurs on heating and can be reversed is heating of an iron rod.
Iron rod can be changed into any shape by heating and this shape can be reversed back to the original state by melting and heating it again.
This is an example of reversible change.

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Question 15

Give one example in each case.
Change which occurs on heating but can be reversed.
Change which occurs on heating but cannot be reversed.
Change which occurs on cooling but can be reversed.
Change which occurs on mixing two substances but can be reversed.
Change which occurs on mixing two substances but cannot be reversed.

Q. Give one example in each case.
(a) Change which occurs on heating but can be reversed.
(b) Change which occurs on heating but cannot be reversed.
(c) Change which occurs on cooling but can be reversed.
(d) Change which occurs on mixing two substances, but can be reversed.
(e) Change which occurs on mixing two substances, but cannot be reversed.

Give one example in each case:

Change occurs on mixing two substances, but can be reversed.

Give one example in each case:

Change occurs on cooling but can be reversed.

Question 17

Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.

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1. Give one example of this kind of case(a) Change which occurs on heating and can be reversed.

1. Give one example of this kind of case
(a) Change which occurs on heating and can be reversed.