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​

Answer 1

Answer:

12).. Melting of ice is a physical change in which substance changes its physical state but not properties.

Hence it is a reversible change in which melted ice can freeze again by decrease in temperature.

13).. statement 1 is correct and statement 2 is incorrect

14).. the condensation of water vapour

15).. option b) because.......

(a) When water is heated to form steam, it can be reversed back. Hence it is a reversible

(b) When the egg is cooked, the egg changes from liquid to solid and there is no way to reverse the change and get back to the reactant. Therefore it is not a reversible change.

(c) Wax can be reversed back on cooling

(d) Cake can also be molten by heating.

question number 16 ka answer pic me hai..

17)..Melting of ice: During this change, the water changes from its solid form to liquid form. It can be solidified again. The water remains water in both cases hence this is a reversible change.

hope it's help you

please follow me

please mark me brainlist