Which of the following statements are true for crystallisation?

It involves formation of new substances.

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It is used to separate solutes soluble in a solvent.

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It is used to obtain large crystals of solute.

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It is an example of a physical change.

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Solution

The correct options are
B It is used to separate solutes soluble in a solvent.
C It is used to obtain large crystals of solute.
D It is an example of a physical change.
Crystallisation is the process of separating a soluble solid from the solution by heating or evaporating the solvent. It can only be used for the substances which are soluble in a solvent. It is a physical change as no new substance is formed. Also, we obtain large crystals of solute after crystallisation.

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Question 15

Fill in the blanks in the following statements using the words given in the box

(a) Making sugar solution is a …………………. change
(b) A physical change is generally ……………………..
(c) Grinding of wheat grain changes its size. It is a …………….. change.
(d) Iron benches kept in lawns and gardens get ……………… it is a …………….
(e) change because a new ……………… is formed

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