The correct match amongst the following is -

Physical states of the dispersed phase and dispersion mediumType of colloid
a. D.P = solid; D.M = liquid i. Foam
b. D.P = solid; D.M = gasii. Emulsion
c. D.P = liquid; D.M = liquid iii. Aerosol
d. D.P = gas; D.M = liquid iv. Sol

(D.P = dispersed phase, and D.M = dispersion medium)

Options:

  • a-iv, b-iii, c-ii, d-i

  • a-iii, b-iv, c-ii, d-i

  • a-iv, b-ii, c-iii, d-i

  •  a-i, b-iii, c-ii, d-iv

An emulsion can be stabilized by use of -

 

 

  •  Emulsifiers.

  • Peptizing agent.

  • Biochemical catalysts.

  • None of the above.

Consider the following statements.

a. Dialysis: It is the process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane.

b. The process of settling colloidal particles is called coagulation or precipitation of the sol.

c. The movement of colloidal particles under an applied electric potential is called electrophoresis.

d. Tyndall effect is used to distinguish between a colloidal and true
solution. 

The incorrect statement(s) is/are-

  • a, b

  • b, c

  • a, b, c

  • None of the above

Consider the following graph between xm (extent of adsorption) and pressure:

The correct relation between T1, T2 and T3 is - 

1. T3< T2 >T12. T1<T2 <T33. T1>T2 >T34. None of the above
  • 1
  • 2
  • 3
  • 4

The graph between logxm vs log p is given below:

The value of the slope is-

 

 

 

  •  12n

  • n

  •  1n

  • 1n2

The right option for the statement "Tyndall effect is exhibited by", is:

  •  Starch solution 

  •  Urea solution

  •  NaCl solution

  •  Glucose solution

 The process of chemisorption is :
  • Highly specific in nature.
  • Dependent on the surface area of the adsorbent.
  • Not specific in nature.
  • Both (1) and (2) 
The ester hydrolysis  remains slow in the beginning and becomes faster after sometime, because : 
  • Acid produced in the reaction acts as an auto-catalyst.
  •  Acid produced in the reaction acts as a poison.
  • Alcohol acts as a negative catalyst in the reaction.
  • Both (2) and (3) 
The role of desorption in the process of catalysis is to :
  • Slower the rate of reaction.
  • Make the surface of solid catalyst free.
  • Increase the temperature of reaction.
  • Decrease the availabilty of surface for reactants.
According to Hardy-Schulze law :
 
  • Polarising power of flocculating ion is directly proportional to its power to cause precipitation.
  • Valence of flocculating ion is directly proportional to its power to cause precipitation.
  •  Polarising power of flocculating ion is inversely proportional to its power to cause precipitation.
  • Both (1) and (2) 
It is essential to wash the precipitate with water before estimating it quantitatively . It is done to:
  • Make volatile product with solution.
  • Make it soluble in the solution.
  • Remove the adsorbed ions.
  • All of the above.
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