Q8 of 20 Page 26

In an activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half filled with water. Which method would you use to get back solid back copper sulphate from the solution?


By the process of evaporation we can get back solid copper sulphate from the solution. The process of evaporation for separating a mixture is based on the fact that liquids vaporize easily whereas solids do not.

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(i) Evaporation


(ii) Decantation


(iii) Filtration


(iv) Churning


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During summer, Boojho carries water in a transparent plastic bottle to his school. The bottle still had some water left in it. The following day, He observed some water droplets on the inner surface day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to

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Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of water were formed? Which of the following should be Boojho’s answer?