MCQ PRACTICE -1

Welcome to your Ncert - class 9- science - Chapter 2 – Is Matter Around Us Pure 1

A mixture consists of a soluble solid in a liquid. which method is most suitable for separating both the components?

Distillation

Handpicking

Sedimentation

Winnowing

None

Ethyl alcohol is completely miscible with water. It can be separated from this mixture by:

Evapouration

Allowing the water to evaporate

Fractional distillation

Using a separate funnel

None

Chromatography is a word that means "colour writing". It is a technique that can be used to separate the components of a mixture.

In this experiment, a marker was used to make a dot of green ink on a piece of paper. The bottom edge of the paper was placed in water and the water travelled vertically up the paper. As a result, the spot of green ink was separated into two colors: blue and yellow.

Which of the following is the best explanation for the fact that the blue ink moved farther up the paper than the yellow ink in this experiment?

Blue ink has a smaller molar mass than yellow ink.

Molecules of blue ink are smaller in size than molecules of yellow ink

Blue ink is more soluble in water than yellow ink is.

The density of blue ink is greater than the density of yellow ink.

None

The suitable method is to separate the following components of the mixtures.

A) Two volatile liquids with appreciable differences in boiling points.

B) Two or more colored constituents soluble in some solvent.

A - Simple distillation, B - Evaporation

A - Fractional distillation, B - decantation

A - Sublimation, B - Chromatography

A - Simple distillation, B - Chromatography

None

Fractional distillation is used to separate liquids having an appreciable difference in their

solubility

None of these

boiling points

size and shape

None

Name the process used for the separation of colours in dye.

Decantation

Chromatography

Distillation

Centrifugation

None

It is possible to obtain oxygen from air by fractional distillation because

Oxygen is more reactive than Nitrogen

Oxygen has higher b.p than Nitrogen

Oxygen is in a different group of the periodic table from Nitrogen

Oxygen has lower density than Nitrogen

None

The copper sulphate solution during crystallization is filtered to:

separate copper

separate impurities

All of the above

form crystals

None

Choose the incorrect option

Aniline is separated from a mixture of aniline and water by the method of steam distillation

Glycerol cannot be separated from spent-lye in soap industries by distillation under reduce pressure.

Acetone and benzene can be separated by fractional distillation

CHCl3 and CCl4 can be separated by fractional distillation

None

10.

Matter that contains two or more constituent substances, combined in definite proportion is called______

mixture

metalloid

compound

element

None

11.

When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide then heat energy is :

Absorbed

Released

First absorbed and then released

Neither absorbed nor released

None

12.

Which of the following statement are true for pure substances?

(i) Pure substances contain only one kind of particles.

(ii) Pure substances may be compounds or mixtures.

(iii) Pure substances have the same composition throughout.

(iv) Pure Substances can be exemplified by all elements other than nickel.

(ii) and (iii)

(i) and (iii)

(iii) and (iv)

(i) and (ii)

None

13.

Which of these is used for the separation of two miscible liquids that have sufficient difference in their boiling points?

Evaporation

Distillation

Crystallisation

Alteration

None

14.

Arrange true solution, colloidal solution, and suspension in the decreasing order of their particle size.

Suspension > True solution > Colloid

Colloid > Suspension > True solution

Suspension > Colloid > True solution

True solution > Colloidal > Suspension

None

15.

The solvent which neither accepts nor donates proton is called________

Amphiprotic

Amphoteric

Neutral

Aprotic

None

16.

Arrange the following steps in the crystallisation of copper sulphate.

A. Dissolve it in a minimum amount of water.

B. Take some (approximately 5 g) impure sample of copper sulphate in a china dish.

C. Cover the solution with filter paper and leave it undisturbed at room temperature to cool slowly for a day.

D. Evaporate water from the copper sulphate solution so as to get a saturated solution.

E. Filter the impurities out.

B, A, D, E, C

A, C, B, D, E

B, A, E, D, C

B, D, A, C, E

None

17.

The colloidal solutions of gold prepared by different methods have different colours. This is due to:

Presence of different types of foreign particles

Difference in size of colloidal particles

The variable valency of gold

Different concentration of gold

None

18.

Petrol and water can be separated by ............ because................

simple distillation, their boiling points slightly differ.

fractional distillation, they are immiscible liquids

separating funnel, they are immiscible liquids.

None of these

None

19.

Tyndall effect observed as a result of scattering of light by particles is observed in

Suspension

None of these

Colloidal solution

True solution

None

20.

How will you separate a solution (miscible) of benzene and chloroform.

Filtration

Crystallisation

Sublimation

Fractional distillation

None

Chapter 1 Matter In Our Surroundings

Chapter 2 – Is Matter Around Us Pure

Chapter 3 – Atoms and Molecules

Chapter 4 – Structure of the Atom

Curriculum

Ncert Class9-Chemistry-Science

Chapter 1 Matter In Our Surroundings

Chapter 2 – Is Matter Around Us Pure

Chapter 3 – Atoms and Molecules

Chapter 4 – Structure of the Atom

MCQ PRACTICE -1