Test: Colloids & Classification of Colloids (Old NCERT) - NEET MCQ

# Test: Colloids & Classification of Colloids (Old NCERT) - NEET MCQ

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## 40 Questions MCQ Test - Test: Colloids & Classification of Colloids (Old NCERT)

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Test: Colloids & Classification of Colloids (Old NCERT) - Question 1

### The size of colloidal particles ranges between

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 1

The size of colloidal particles is 10-5 to 10-7 cm which is intermediate between true solution and suspension.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 2

### Which of the following will not form a colloidal system?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 2

Gas-gas is a true so|ution.

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Test: Colloids & Classification of Colloids (Old NCERT) - Question 3

### Fog is an example of colloidal system of

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 3

Liquid (water droplets) are dispersed in gas (air) in fog.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 4

A colloidal system in which liquid is dispersed phase and solid is dispersion medium is classified as

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 4

Gel is a colloidal system in which liquid is dispersed in a solid.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 5

Which of the following examples is correctly matched?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 5

The gel is the colloid in which the dispersion phase is liquid and the dispersion medium is solid. Butter is an example of a gel.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 6

Mark the incorrect combination out of the following examples of colloidal solutions.

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 6

Gel has liquid dispersed in solid.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 7

Lyophilic sols are also called reversible colloids because

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 7

If the dispersed phase is removed completely from the colloidal system, it can be formed again by mixing dispersion medium with it.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 8

Which of the following factors contribute towards higher stability of lyophilic colloid?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 8

Lyophilic colloids are highly solvated hence more stable.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 9

A lyophobic colloid cannot be formed by

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 9

Lyophobic colloids cannot be prepared by simple mixing of dispersed phase and dispersion medium.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 10

Which of the following is not the correct difference between lyophobic and lyophillic sols?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 10

Lyophobic sols are irreversible while lyophilic sols are reversible.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 11

Which of the following is not correctly matched?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 11

Gold sol is a Lyophilic colloid.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 12

Substances which behave as normal electrolytes in solution at low concentration and exhibit colloidal properties at higher concentration are called

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 12

At higher concentration the aggregated particles called micelles are formed by electrolytes like soap which act as colloidal particles.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 13

In these colloids, a large number of small atoms or smaller molecules of a substance aggregate to form colloidal particles having size in colloidal range. These colloids are known as

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 13

In multimolecular colloids the smaller particles aggregate and are held together by van der Waal's forces. e.g., sols of gold atoms and sulphur molecules.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 14

The substances which behave as colloidal solutions at higher concentration are called

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 14

Substances whose molecules aggregate spontaneously in a given solvent to form particles of colloidal dimensions are called associated colloids or micells.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 15

The formation of micelles takes place only above

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 15

The formation of micelles takes place only above a particular temperature called Kraft  temperature (TK).

Test: Colloids & Classification of Colloids (Old NCERT) - Question 16

The critical micelle concentration (CMC) is defined as

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 16

CMC is the concentration below which no micellization takes place.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 17

At CMC (critical micelle concentration) the surface molecules:

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 17

At CMC, the particles of an electrolyte aggregate and form associated colloids known as micelles.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 18

In the given figure label the parts.

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 18

The RCOO- ion formed in the water contains two parts, a long hydrocarbon chain R (non-polar or hydrophobic tail) and a polar group COO- (polar or hydrophilic head).

Test: Colloids & Classification of Colloids (Old NCERT) - Question 19

Soap mixed with water below critical micelle concentration behaves as

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 19

In lower concentration i.e., below critical micelle concentration (CMC) soap behaves like normal electrolytic solution.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 20

White of an egg whipped with water acts as

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 20

White of an egg whipped with water acts as a macromolecular colloid.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 21

Colloidal solutions of metals like gold can be prepared when their salt solutions react with certain substances like SnCl2, formaldehyde, phenyl hydrazine, etc.
2AuCl3 ​ + 3SnCl2 ​ → 3SnCl4​ + 2Ausol
The above method is an example of

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 21

Salt solution of gold is being reduced to gold by using a reducing agent like SnCl2.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 22

In Bredigs arc method an electric arc is struck between the metal electrodes under the surface of water containing some stabilizing agent. The process involves

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 22

The method involves both dispersion and condensation. The intense heat of arc vapourises some of the metal which condenses under cold water.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 23

When a small quantity of FeCl3 solution is added to the fresh precipitate of Fe(OH)3, a colloidal sol is obtained. The process through which this sol is formed is known as

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 23

Peptization involves conversion of freshly prepared precipitate into colloidal particles using a suitable electrolyte.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 24

Which of the processes is being shown in the figure?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 24

When an electric field is applied to purify an impure colloidal solution, the process is known as electrodialysis. The ions present in the colloidal solution migrate out to the oppositely charged electrodes.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 25

Which of the following is not a method of removing impurities from a colloidal sol?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 25

Distillation cannot be used to remove impurities from colloidal sol.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 26

Tyndall effect is observed only when
(i) the diameter of the dispersed particles is not much smaller than the wavelength of the light used.
(ii) the refractive indices of dispersed phase and dispersion medium differ greatly in magnitude.
(iii) the size of the particles is generally between 10-11 and 10-9 m in diameter.
(iv) the dispersed phase and dispersion medium can be seen separately in the system.

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 26

Tyndall effect is observed only when these two conditions are satisfied.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 27

When a colloidal solution is viewed from the direction at right angles of light beam, the path of the beam is illuminated due to scattering of light In the figure (A) and (B) are

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 27

The bright cone of the light is known as Tyndall cone. The scattering of light is seen by the microscope.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 28

Tyndall effect is not observed in

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 28

Tyndall effect is due to the scattering of light by colloidal particles. Sugar solution is a true homogeneous solution which will not show Tyndall effect.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 29

Which of the following systems will show Tyndall effect?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 29

Aqueous solution of Al(OH)3 will show Tyndall effect since it is a colloidal solution. All other solutions are true solutions.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 30

The cause of Brownian movement which is not shown by true solutions or suspensions is due to

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 30

The colloidal particles are in a continuous zig-zag motion due to unbalanced bombardment of the particles by mole cules of the dispersion medium.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 31

Why is ferric hydroxide colloid positively charged when prepared by adding ferric chloride to hot water?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 31

The adsorption of positively charged Fe3+ ions by the sol of hydrated ferric oxide results in positively charged colloid.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 32

When an excess of a very dilute aqueous solution of KI is added to a very diute aqueous solution of silver nitrate, the colloidal particles of silver iodide are associated with which of the following Helmholtz double layer?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 32

As excess of KI has been added, I- ions are adsorbed on Agl forming a fixed layer (and giving it a negative charge). It then attracts the counter ions (K+) from the medium forming a second layer (diffused layer).

Test: Colloids & Classification of Colloids (Old NCERT) - Question 33

The combination of two layers of opposite charges around the colloidal particle is called Helmholtz electrical double layer. The potential difference between the fixed layer and the diffused layer of opposite charge is called

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 33

The first layer of ions is firmly held and is termed as fixed layer while the second layer is mobile or diffused layer according to Helmholtz electrical double layer. The potential difference between fixed and diffused layer is called electrokinetic potential or zeta potential.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 34

Which of the following is not an explanation for the origin of charge on the colloidal particles?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 34

Due to the presence of charge on colloidal particles, electrophoresis takes place.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 35

Movement of dispersion medium under the influence of electric field is known as

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 35

When movement of particles (electrophoresis) is prevented by some suitable means, it is observed that the dispersion medium begins to move in an electric field. This phenomenon is termed as electroosmosis.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 36

Why is alum added to water containing suspended impurities?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 36

The water obtained from natural sources often contains suspended impurities. Alum is added to such water to coagulate the suspended impurities and make water fit for drinking purposes.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 37

Mixing of positively charged colloidal solution with negatively charged colloidal solution brings _____. The decreasing order of coagulating power of Na+, Ba2+ and AI3+ for negatively charged colloidal solution is _____.

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 37

According to Hardy Schulze rule, the coagulating power of an ion depends upon its valency. Higher the valency of ion, greater is its coagulating power.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 38

Which of the following acts as the best coagulating agent for ferric hydroxide sol?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 38

The efficiency of coagulation of an electrolyte depends upon its valency. Thus [Fe(CN)6]4- is the best coagulating agent for Fe(OH)3 sol.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 39

Fe(OH)3 sol can be more easily coagulated by Na3PO4 in comparison to KCl because

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 39

Ferric hydroxide is a positively charged sol hence ions carrying negative charge can coagulate it Since PO3-4 has higher negative charge than Cl- hence it is more effective for coagulation.

Test: Colloids & Classification of Colloids (Old NCERT) - Question 40

Which out of the following electrolyte solutions having the same concentration will be most effective in causing the coagulation of arsenic sulphide sol?

Detailed Solution for Test: Colloids & Classification of Colloids (Old NCERT) - Question 40

As2S3 is a negatively charged soL To cause its coagulation, the ions must be positively charged. Greater the magnitude of positive charge, greater will be its coagulating power. Thus AlC13 containing Al3+ ion will be most effective in causing coagulation of As2S3.

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