MCQ PRACTICE -1

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

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.

(iii) and (iv)

(ii) and (iii)

(i) and (iii)

(i) and (ii)

None

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

Winnowing

Sedimentation

Distillation

Handpicking

None

Choose the incorrect option

Acetone and benzene can be separated by fractional distillation

CHCl3 and CCl4 can be separated by fractional distillation

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.

None

The solvent which neither accepts nor donates proton is called________

Amphiprotic

Neutral

Aprotic

Amphoteric

None

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

Evaporation

Crystallisation

Alteration

Distillation

None

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

Fractional distillation

Sublimation

Filtration

Crystallisation

None

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

Presence of different types of foreign particles

Different concentration of gold

The variable valency of gold

Difference in size of colloidal particles

None

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

B, D, A, C, E

B, A, E, D, C

A, C, B, D, E

None

The copper sulphate solution during crystallization is filtered to:

All of the above

separate impurities

form crystals

separate copper

None

10.

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.

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

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

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

None

11.

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

Suspension

True solution

None of these

Colloidal solution

None

12.

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

Evapouration

Using a separate funnel

Fractional distillation

Allowing the water to evaporate

None

13.

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

Distillation

Chromatography

Decantation

Centrifugation

None

14.

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

compound

element

mixture

metalloid

None

15.

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

Oxygen is more reactive than Nitrogen

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

Oxygen has lower density than Nitrogen

Oxygen has higher b.p than Nitrogen

None

16.

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

simple distillation, their boiling points slightly differ.

separating funnel, they are immiscible liquids.

fractional distillation, they are immiscible liquids

None of these

None

17.

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

solubility

None of these

boiling points

size and shape

None

18.

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

First absorbed and then released

Neither absorbed nor released

Absorbed

Released

None

19.

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

Suspension > Colloid > True solution

True solution > Colloidal > Suspension

Suspension > True solution > Colloid

Colloid > Suspension > True solution

None

20.

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 - Chromatography

A - Simple distillation, B - Evaporation

A - Fractional distillation, B - decantation

A - Sublimation, B - Chromatography

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