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Permanent Change

Which of the ...

Question

Which of the following is a physical but irreversible change?
(a) burning of matchstick
(b) melting of ice cream
(c) breaking of a flower vase
(d) lighting of an electric bulb

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Solution

(c) breaking of a flower vase
A broken flower vase cannot be reconstituted. Therefore, it is a physical but irreversible change.

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Similar questions

Q. Fill in the blanks with the correct words.
1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
4. Breaking of glass is a .................... (physical/chemical) change.
5. .................... (Heating/Cooling) causes steam to change into water.

Melting of ice cream is a ___ change. (reversible/irreversible)

Q. 78. Consider the following pairs:
Change Type of Change
1. Melting of ice cube: Physical Change
2. Digesting food: Chemical Change
3. Burning wood: Chemical Change
4. Breaking a glass: Chemical Change
5. Cooking an egg: Physical Change
Which of the pairs given above is/are correctly matched?

Q. State whether the following statements are true or false. Rewrite the false ones correctly.
(a) All irreversible changes are chemical changes.
(b) A liquid can sublime.
(c) The evaporation of water take place only at 100°C. when it is boiling.
(d) The melting of ice is a physical change.
(e) The souring of milk is a periodic change.
(f) The flowering of trees is a periodic change.
(g) Solidification and condensation are the same.
(h) The breaking of glass tumbler is a chemical change because it is irreversible.
(i) Boiling, evaporation and condensation are physical changes.

Which of the following are physical changes and which are chemical changes?

(a) Burning of a magnesium wire

(b) Freezing of water

(c) Rusting of iron

(d) Glowing of an electric bulb

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