2. State whether this change can be reversed or not.
(f) Making biogas from cow dung.

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Solution

A change that can be reversed or can get back to its original state is called a reversible change.
Bio gas can be prepared from cow dung.
But this biogas cannot be changed back to cow dung.
Hence, this is an irreversible change and cannot be reversed.

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2. State whether this change can be reversed or not.

(b) Folding a paper to make a toy aeroplane.

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Question 12

Which of the following changes cannot be reversed?
Blowing of a ballon
Folding a paper to make a toy aeroplane
Rolling a ball of dough to make roti
Baking cake in an oven
Drying a wet cloth
Making biogas from cow dung
Burning of a candle

Q. Which of the following change cannot be reversed?
(a) Blowing of a balloon
(b) Folding a paper to make a toy aeroplane.
(c) Rolling a ball of dough to make roti
(d) Baking cake in an oven
(e) Drying a wet cloth
(f) Making biogas from cow dung.
(g) Burning of a candle.

2. State whether this change can be reversed or not.

(g) Burning of a candle.

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2. State whether this change can be reversed or not.(f) Making biogas from cow dung.

A change that can be reversed or can get back to its original state is called a reversible change.Bio gas can be prepared from cow dung.But this biogas cannot be changed back to cow dung.Hence, this is an irreversible change and cannot be reversed.

2. State whether this change can be reversed or not.
(f) Making biogas from cow dung.

A change that can be reversed or can get back to its original state is called a reversible change.
Bio gas can be prepared from cow dung.
But this biogas cannot be changed back to cow dung.
Hence, this is an irreversible change and cannot be reversed.