12. please all student gave your answer test ho rahi hai kisne pahele answer diya use le 20 point diga okWhich 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?
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the narrator of Hadith of the bromine is a good time to
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