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Reversible and Irreversible Changes

Which of thes...

Question

Which of these is an irreversible change?
(a) Melting of wax
(b) Freezing of water
(c) Boiling of water
(d) Burning of paper

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Solution

(d) burning of paper
Once the paper is burnt, it cannot be converted to paper again.

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Classify the following as a physical or a chemical change :

(a) Drying of wet clothes

(b) Manufacture of salt from seawater.

(c) Butter getting rancid

(d) Boiling of water

(e) Burning of paper

(f) Melting of wax

(g) Burning of coal

Q. Which of these is a physical and irreversible change?
(a) burning of a paper
(b) evaporation of water
(c) breaking of a glass tumbler
(d) lighting of an electric bulb

Q. Which of these is an irreversible physical change?

(a) rusting of iron
(b) freezing of water
(c) a double decomposition reaction
(d) breaking of a glass tumbler

Q. Give a reason, why?

A. Freezing of water is a reversible change while burning of a candle an irreversible change.

B. Change of seasons is a periodic change while the burning of weather is a non-periodic change.

Some changes are given below.

(a) Freezing of water

(b) Melting of ice

(c) Boiling of water

Are these considered as physical changes? If yes, give the reason.

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