The volumes of gasses H2, CH4, NH3 and CO2 adsorbed by 1 g of charcoal at 298 K in the decreasing order are

1.  NH3, CO2, CH4, H2

2.  CO2, NH3,  H2, CH4

3.  H2, CH4, CO2, NH3

3.  CH4, NH3, CO2, H2

Subtopic:  Adsorption and Absorption |
 57%
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The coagulation of 200 mL of a positive colloid took place when 0.73 g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is

1.  36.5

2.  100

3.  200

4.  150

Subtopic:  Colloidal Solution |
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Which is correct in case of van der Waals adsorption?

1.  High temperature; low pressure

2.  Low temperature; high pressure

3.  Low temperature; low pressure

4.  High temperature; high pressure

 

Subtopic:  Adsorption and Absorption |
 75%
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The coagulation of 100 ml of colloidal solution of gold is completely prevented by the addition of 0.25 gm of a substance 'X' to it before adding 1 ml of 10%  NaCl solution. The gold number of 'X' is

1.  25

2.  0.25

3.  2.5

4.  0.025

Subtopic:  Colloidal Solution |
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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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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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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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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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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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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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