Question 6

Rolling of chapatti and baking of chapatti are the changes that
(a) can be reversed
(b) cannot be reversed
(c) can be reversed and cannot be reversed, respectively
(d) cannot be reversed and can be reversed, respectively

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Solution

Rolling of chapatti can be reversed and baking of chapatti cannot be reversed. So, option (c) is the correct answer.

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Question 19

Paheli mixed flour and water and (a) made a dough, (b) rolled the dough to make a chapatti, (c) baked the chapatti on a pan, (d) dried the chapatti and ground it in a grinder to make powder. Identify the changes (a) to (d) as the changes that can be reversed or that cannot be reversed.

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

Question 8

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a:
(a) physical change that can be reversed
(b) chemical change that can be reversed
(c) physical change that cannot be reversed
(d) chemical change that cannot 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.

Q. Which of the following change can be reversed?

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Question 6 Rolling of chapatti and baking of chapatti are the changes that (a) can be reversed (b) cannot be reversed (c) can be reversed and cannot be reversed, respectively (d) cannot be reversed and can be reversed, respectively

Rolling of chapatti can be reversed and baking of chapatti cannot be reversed. So, option (c) is the correct answer.

Question 6

Rolling of chapatti and baking of chapatti are the changes that
(a) can be reversed
(b) cannot be reversed
(c) can be reversed and cannot be reversed, respectively
(d) cannot be reversed and can be reversed, respectively