A change that cannot be reversed is called ___________ change.

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Solution

Irreversible change: The change which cannot be reversed even by changing conditions is said to be an irreversible change.
Example: Burning of paper, Cooking of food, etc.
Hence, A change that cannot be reversed is called irreversible change.

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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

Q. A change that cannot be reversed is called ________ change, while the change which can be reversed is called _______ change.

Burning is a chemical change that can be reversed.

Question 5

Salt can be separated from its solution (salt dissolved in water) because
(a) mixing of salt in water is a change that can be reversed by heating and melting of salt
(b) mixing of salt in water is a change that cannot be reversed
(c) mixing of salt in water is a permanent change
(d) mixing of salt in water is a change that can be reversed by evaporation

show that a physical change can easily be reversed??

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A change that cannot be reversed is called ___________ change.

Irreversible change: The change which cannot be reversed even by changing conditions is said to be an irreversible change.Example: Burning of paper, Cooking of food, etc.Hence, A change that cannot be reversed is called irreversible change.

Irreversible change: The change which cannot be reversed even by changing conditions is said to be an irreversible change.
Example: Burning of paper, Cooking of food, etc.
Hence, A change that cannot be reversed is called irreversible change.