Colloids, Micelles and and Emulsions

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JEE Advanced 2021

LEVELJEE Main

The correct statement(s) related to colloids is(are)

* Multiple Correct Options

(A)

The process of precipitating colloidal sol by an electrolyte is called peptization.

(B)

Colloidal solution freezes at higher temperature than the true solution at the same concentration.

(C)

Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature

(D)

Micelles are macromolecular colloids.

JEE Advanced 2019

LEVELJEE Advanced

Molar conductivity ( $Λ_{m}$ ) of aqueous solution of sodium stearate, which behaves as a strong electrolyte, is recorded at varying concentration(c) of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution? (Critical micelle concentration (CMC) is marked with an arrow in the figures.)

The qualitative sketches I , II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of $KCl$ , $CH_{3} OH$ and $CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}$ at room temperature. The correct assignment of the sketches is -

(A)

I :

KCl

, II :

CH_{3} OH

, III :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

(B)

I :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

, II :

CH_{3} OH

, III :

KCl

(C)

I :

KCl

, II :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

, III :

CH_{3} OH

(D)

I :

CH_{3} OH

, II :

KCl

, III :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

JEE Advanced 2023

LEVELJEE Main

Consider the following statements related to colloids. (I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium. (II) For emulsions, both the dispersed phase and the dispersion medium are liquid. (III) Micelles are produced by dissolving a surfactant in any solvent at any temperature. (IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium. The option with the correct set of statements is

Sodium stearate $CH_{3} (CH_{2})_{16} COO^{-} Na^{+}$ is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following. [2021, 22 July Shift-I]

(A)

It forms spherical micelles with

CH_{3} (CH_{2})_{16}

group pointing towards the centre of sphere.

(B)

It forms non-spherical micelles with

- COO^{-}

group pointing outwards on the surface.

(C)

It forms spherical micelles with

CH_{3} (CH_{2})_{16}

group pointing outwards on the surface of sphere.

(D)

It forms non-spherical micelles with

CH_{3} (CH_{2})_{16}

group pointing towards the centre.

JEE Main 2020

LEVELJEE Main

An ionic micelle is formed on the addition of

(A)

liquid diethyl ether to aqueous NaCl solution

(B)

sodium stearate to pure toluene excess water to liquid

JEE Main 2021

LEVELJEE Main

When silver nitrate solution is added to potassium iodide solution then the sol produced is

(A)

AgI / I^{-}

(B)

AgI / Ag^{+}

(C)

KI / NO_{3}^{-}

(D)

AgNO_{3} / NO_{3}^{-}

JEE Main 2021

LEVELJEE Main

100 mL of $0.0018% (w/v)$ solution of $Cl^{-}$ ion was the minimum concentration of $Cl^{-}$ required to precipitate a negative sol in one h. The coagulating value of $Cl^{-}$ ion is ......... (Nearest integer)

JEE Main 2021

LEVELBoard

Which of the salt-solution is most effective for coagulation of arsenious sulphide?

(A)

BaCl_{2}

(B)

AlCl_{3}

(C)

Na_{3} PO_{4}

(D)

NaCl

JEE Main 2021

LEVELJEE Main

Lyophilic sols are more stable than lyophobic sols because

(A)

there is a strong electrostatic repulsion between the negatively charged colloidal particles.

(B)

the colloidal particles have positive charge.

(C)

the colloidal particles have no charge.

(D)

the colloidal particles are solvated.

JEE Main 2019

LEVELJEE Main

Among the following, the false statement is

(A)

Tyndall effect can be used to distinguish between a colloidal solution and a true solution

(B)

It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane

(C)

Lyophilic sol can be coagulated by adding an electrolyte

(D)

Latex is a colloidal solution of rubber particles which are positively charged

JEE Main 2021

LEVELJEE Main

Match List I with List II. \begin{array}{ll} \text{List I} & \text{List II} \\ \text{(A) Cheese} & \text{I. Dispersion of liquid in liquid} \\ \text{(B) Pumice stone} & \text{II. Dispersion of liquid in gas} \\ \text{(C) Hair cream} & \text{III. Dispersion of gas in solid} \\ \text{(D) Cloud} & \text{IV. Dispersion of liquid in solid} \end{array} Choose the most appropriate answer from the options given below.

(A)

\to

IV, B

\to

III, C

\to

II, D

\to

(B)

\to

IV, B

\to

I, C

\to

III, D

\to

(C)

\to

III, B

\to

IV, C

\to

I, D

\to

(D)

\to

IV, B

\to

III, C

\to

I, D

\to

JEE Main 2008

LEVELJEE Main

Gold numbers of protective colloids $A$ , $B$ , $C$ and $D$ are $0.50$ , $0.01$ , $0.10$ and $0.005$ , respectively. The correct order of their protective powers is

(A)

D < A < C < B

(B)

C < B < D < A

(C)

A < C < B < D

(D)

B < D < A < C

JEE Main 2019

LEVELJEE Main

The correct option among the following is

(A)

colloidal medicines are more effective, because they have small surface area.

(B)

brownian motion in colloidal solution is faster if the viscosity of the solution is very high.

(C)

addition of alum to water makes it unfit for drinking.

(D)

colloidal particles in lyophobic sols can be precipitated by electrophoresis.

JEE Main 2021

LEVELJEE Main

The sol given below with negatively charged colloidal particles is

(A)

FeCl_{3}

added to hot water

(B)

KI

added to

AgNO_{3}

solution

(C)

AgNO_{3}

added to

KI

solution

(D)

Al_{2} O_{3} \cdot x H_{2} O

in water

JEE Main 2020

LEVELJEE Main

Tyndall effect is observed when

(A)

the diameter of dispersed particles is much larger than the wavelength of light used

(B)

the diameter of dispersed particles is much smaller than the wavelength of light used

(C)

the refractive index of dispersed phase is greater than that of the dispersion medium

(D)

the diameter of dispersed particles is similar to the wavelength of light used

JEE Main 2020

LEVELJEE Main

A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, HCHO and water. The component which ensures stability of the ink sample is

Among the colloids cheese (C), milk (M) and smoke (S), the correct combination of the dispersed phase and dispersion medium, respectively is

(A)

C : liquid in solid; M : liquid in liquid; S : solid in gas

(B)

C : solid in liquid; M : liquid in liquid; S : gas in solid

(C)

C : liquid in solid; M : liquid in solid; S : solid in gas

(D)

C : solid in liquid; M : solid in liquid; S : solid in gas

JEE Main 2021

LEVELJEE Main

Most suitable salt which can be used for efficient clotting of blood will be

(A)

NaHCO_{3}

(B)

FeSO_{4}

(C)

Mg(HCO_{3})_{2}

(D)

FeCl_{3}

LEVELJEE Main

Alum is widely used to purify water since

(A)

it forms complex with clay particles

(B)

it coagulates the mud particles

(C)

it exchanges

Ca^{2 +}

and

Mg^{2 +}

ions present in hard water

(D)

its sulphate ion is water purifier

JEE Main 2021

LEVELJEE Main

The charges on the colloidal $CdS$ sol and $TiO_{2}$ sol are, respectively

(A)

positive and positive

(B)

positive and negative

(C)

negative and negative

(D)

negative and positive

LEVELJEE Main

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statement is not correct?

(A)

Coagulation in both sols can be brought about by electrophoresis

(B)

Mixing the sols has no effect

(C)

Sodium sulphate solution causes coagulation in both sols

(D)

Magnesium chloride solution coagulates the gold sol more readily than the iron (III) hydroxide sol

The correct statement(s) related to colloids is(are)

An ionic micelle is formed on the addition of

When silver nitrate solution is added to potassium iodide solution then the sol produced is

A colloidal system consisting of a gas dispersed in a solid is called a/an

Peptisation is a

The aerosol is a kind of colloid in which

Which of the salt-solution is most effective for coagulation of arsenious sulphide?

Lyophilic sols are more stable than lyophobic sols because

Among the following, the false statement is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is

The correct option among the following is

The sol given below with negatively charged colloidal particles is

Tyndall effect is observed when

A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, HCHO and water. The component which ensures stability of the ink sample is

Among the colloids cheese (C), milk (M) and smoke (S), the correct combination of the dispersed phase and dispersion medium, respectively is

Most suitable salt which can be used for efficient clotting of blood will be

Alum is widely used to purify water since

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The charges on the colloidal CdS sol and TiO2​ sol are, respectively

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statement is not correct?

Gold numbers of protective colloids $A$ , $B$ , $C$ and $D$ are $0.50$ , $0.01$ , $0.10$ and $0.005$ , respectively. The correct order of their protective powers is

The charges on the colloidal $CdS$ sol and $TiO_{2}$ sol are, respectively