The protecting power of lyophilic colloidal sol is expressed in terms of 

(a) coagulation value

(b) gold number

(c) critical micelle concentration

(d) oxidation number

Subtopic:  Lyophilic & Lyophobic Sol |
 89%
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The stabilization of the dispersed phase in a lyophobic sol is due to

(1) The viscosity of the medium

(2) The surface tension of the medium

(3) Liking for the medium

(4) The formation of an electrical layer between the two phases

Subtopic:  Lyophilic & Lyophobic Sol |
 82%
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The process of converting precipitate into collidal solution on adding an electrolyte is called:

(A) Peptisation                             

(B) Dialysis

(C) Electro-osmosis                     

(D) Eelectrophoresis

Subtopic:  Colloidal Solution |
 87%
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Emulsifying agent stabilized the emulsion of oil in water by

1.  Forming an interfacial film between suspended particles and the medium

2.  Dissolving the suspended particles into the medium completely

3.  Coagulating the suspended particles from medium completely

4.  Converting the suspended particles into vapor completely

 

Subtopic:  Emulsions |
 68%
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If 227g of charcoal having, active surface area 1000 m2/g is used for monolayer absorption of a gas having molecular radius 10-8 cm, then volume of the absorbed gas at STP is [Avogadro's number = 6 × 1023]

1.  11.2 L

2.  22.4 L

3.  7.46 L

4.  3.73 L

Subtopic:  Adsorption and Absorption |
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Among the following, the surfactant that will form micelles in aqueous solution at the highest molar concentration

1.  CH3 - CH214 - OSO3- K+

2.  CH3 - CH210 - COO- Na+

3.  CH3 - CH211 - COO3- Na+

4.  CH3 - CH215 - N+H3 Bre

Subtopic:  Emulsions |
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Some types of gels like gelatin liquify on shaking, thereby changing into sols. The sols on standing change back into a gel. The process is known as

1.  Syneresis

2.  Thixotropy

3.  Peptisation

4.  Imbition

 

Subtopic:  Colloidal Solution |
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A colloid of Agl is formed mixing AgNO3 with an excess of Kl. Which of the given electrolyte will have highest coagulation value for it?

1.  BaSO4

2.  NaCl

3.  MgCl2

4.  Al2SO43

Subtopic:  Colloidal Solution |
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The decreasing order of coagulating power of an electrolyte to coagulate the As2S3 sol is

1.  NaCl > Al2SO43 > Ba3PO42

2.   Ba3PO42 > NaCl > Al2SO43 

3.  Al2SO43  > Ba3PO42 > NaCl 

4.  NaCl >Ba3PO42 > Al2SO43 

Subtopic:  Colloidal Solution |
 83%
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When detergent is added in water, some properties are measured with respect to concentration. Choose the incorrect plot.

1.  

2.  

3.  

4.  

Subtopic:  Adsorption Isotherm |
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