Lyophilic sols are:

(1) Irreversible sols

(2) They are prepared from inorganic compounds

(3) Not coagulated by adding electrolytes

(4) Self-stabilizing

Subtopic:  Lyophilic & Lyophobic Sol |
 66%
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The volume of colloidal particles Vc as compared to the volume of solute particles in true solution Vs could be:

(1) ~1

(2) ~103

(3) ~102

(4) ~10-3

Subtopic:  Colloidal Solution |
 58%
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The dispersed phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively, which of the following statement is not correct?

(1) MgCl2 solution coagulates gold sol readily than iron (III) hydroxide sol  at pH = 7

(2) Na2SO4 solution causes coagulation in both sol

(3) Mixing of two sols have no effect

(4) Coagulation in both sol can be brought about by electrophoresis

Subtopic:  Colloidal Solution |
 54%
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Pick out the wrong statement.

1. Micelles are formed by surfactant molecules above the Critical Micelle Concentration (CMC)

2. The conductivity of a solution having surfactant molecules decreases sharply at the CMC

3. Lower is the CMC of detergent, more is its detergency

4. Cleansing action is not related to micelles

Subtopic:  Emulsions |
 75%
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Among the following surfactant molecules, the surfactant with the lowest CMC in aqueous solution at ambient conditions is:

1. CH3(CH2)15N+(CH3)3Br-

2. CH3(CH2)11OSO3Na+

3. CH3(CH2)6COO-Na+

4. CH3(CH2)11N+(CH3)3Br-

Subtopic:  Emulsions |
From NCERT
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Which one of the following is the correct option?

1.

Solid sol

-

Smoke

2.

Emulsion

-

butter

3.

Foam

-

Mist

4.

Whipped cream

-

sol

Subtopic:  Colloidal Solution |
 67%
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The coagulation values in millimoles per liter of the electrolytes used for the coagulation of As2S3 are given below

(I) (NaCl)=52 , (II) (BaCl2)=0.69  , (III) (MgSO4)=0.22

The correct order of their coagulating power is -

1. III > II > I

2. I > II > III

3. I > III > II 

4. II > III>I

Subtopic:  Colloidal Solution |
 86%
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The separation of colloidal particles (or purification of sol) from particles of molecular dimensions is known as:

1. Photolysis

2. Dialysis

3. Pyrolysis

4. Peptization

Subtopic:  Colloidal Solution |
 75%
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A catalyst is a substance that:

(1) Increases the equilibrium constant of the reaction

(2) Changes the equilibrium conc. of reaction

(3) Shortens the time to reach equilibrium

(4) Supplies the energy of the reaction

Subtopic:  Catalyst |
 84%
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A catalyst:

(1) Increases the average kinetic energy of the reacting molecules

(2) Increases the activation energy

(3) Alters the reaction path mechanism

(4) Increases the frequency of collisions of the reacting species

Subtopic:  Catalyst |
 52%
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