Anil Ahlawat Solutions for Chapter: Is Matter Around Us Pure, Exercise 1: EXERCISES

Natural water is impure and needs to be purified before this water can be supplied to homes for drinking purposes. The sequence of steps involved in purification of water is

Ms Mehta, a science teacher gave different mixtures to four groups of students to separate their components. Which group was not following the correct method?

Read the given passage and fill in the blanks by selecting an appropriate option.

When a mixture of two (i) liquids having a difference of $25°\mathrm{C}$ in their boiling points is to be separated, a (ii) is used which increases the (iii) surface area. As a result, when the vapours of both the liquids rise, the (iv) volatile liquid will condense while the vapours of (v) volatile liquid will rise.

Study the given Venn diagram carefully.

Which of the following colloidal systems correctly represent points $1, 2$ and $3$?

Match column $\mathrm{I}$ with column $\mathrm{II}$ and select the correct option from the given codes.

Study the given flow chart and select the correct statements.

$\text{ Sulphur + Coal powder + Common salt }$

(i) The property used to separate the mixture is the solubility of different components in different solvents.

(ii) Sulphur is soluble in carbon disulphide, salt in water and coal is insoluble in both.

(iii) $\mathrm{X}$ is water and $\mathrm{Y}$ is carbon disulphide.

Siddharth dissolved a mixture into water and then filtered it. Solid $\mathrm{X}$ was left behind as residue in the filter paper and solid $\mathrm{Y}$ was obtained by evaporating the filtrate to dryness. $\mathrm{X}$ and $\mathrm{Y}$ could be respectively.

Which of the following statements about the given experimental set-up is/are incorrect?

I. It is used to separate a mixture of two or more miscible liquids for which the difference in boiling points is more than $25 \mathrm{K}$ .
II. It is used for the separation of different gases from the air.
III. It is used to separate acetone and water from their mixture.
IV. It is based on the principle of repeated cooling and condensation of vapours by providing a surface for the vapours.