Question

12. Which of the following is not a reversible change?

(1) The vaporisation of water

(2) The melting of iron

(3) The freezing of water

(4) The burning of kerosene

13. Statement-I : A change which can be reversed is called a reversible change.

Statement-II : Falling of leaves from a tree is reversible change.

(1) Both statements I and II are correct.

(2) Both statement I and II are incorrect.

(3) Statement I is correct and statement II is incorrect.

(4) Statement I is incorrect and statement II is correct.

14. Which of the following is not an irreversible change?

(1) The ripening of a mango

(2) The curdling of milk

(3) The condensation of water vapour

(4) The slaking of lime

15. Which of the following is not a reversible change?

(1) Heating of water to steam

(2) Cooking of egg to scrambled eggs

(3) Heating of wax to molten wax

(4) Cooling of water to ice

II. SUBJECTIVE TYPE QUESTIONS :

16. Give some examples from daily life where expansion of metal by heating is used and also explain it.

17. Most physical changes are reversible give reasons with two examples?

18. Write the various characteristics of

(1) Physical change (2) chemical change

III. HOTS (High Order Thinking Skills) :

19. Explain why:

(i) Printing is an irreversible change.

(ii) Ironing of cloth is reversible change.

(iii) Melting of wax is a reversible change.

20. Differentiate between reversible and irreversible change? all question attempt test for today's student​

Answer 1

Answer:

12. (3) i hope this helps u

baaki ka i don't know sorry

Answer 2

12 .Answer : the burning of kerosene

Explination : the example of reversable changes are : water = H2o when the water freezes it becomes ice and when we kept it on outside its becomes water

so the burning kerosene will burns and then becomes the fire and when the fire is fires from 2 minutes and then fire becomes Co2 = smoke

so in this kerosene - fire - smoke and then the kerosene didn't come back again so it is not a "Reversable change "

hope you like answer .