Question

Rolling of chapati and baking of chapati are the changes that

• A. Can be reversed
• B. Cannot be reversed
• C. Can be reversed and cannot be reversed,
• D. Cannot be reversed and can be reversed, respectively

Answer 1

The correct option is C

Can be reversed and cannot be reversed,

Explanation for correct option:

Option C:

Reversible changes:

• Reversible changes are changes that can not be reversed.
• Reversible changes are temporary changes.
• For example – Melting of wax, freezing of ice, and boiling water which evaporates as steam and condenses back into the water.

Irreversible changes:

• Irreversible changes are permanent changes.
• Reactants react to form an entirely new compound and cannot be reversed.
• For example – Burning a piece of paper, and cooking the raw egg.

Now,

• The rolling of chapati is a physical and reversible change because there is no change in the properties of kneaded flour. We can get the kneaded flour back from the rolling chapati.
• But once the chapati is baked, it cannot be reversed. So, it is a type of reversible change because we cannot get the kneaded flour from the baked chapati.

Therefore, option C is correct. Rolling of chapati and baking of chapati are the changes that can be reversed and cannot be reversed respectively.