Chemistry - Adsorption and Colloids

Question - 1

Which one of the following is a natural colloid?

  • A sodium chloride solution
  • B cane sugar solution
  • C urea solution
  • D blood

Question - 2

Colloidal solutions of gold prepared by different methods are of different colours because of 

  • A different diameters of colloidal gold particles 
  • B Variable valency of gold 
  • C different concentration of gold particles
  • D impurities produced by different methods

Question - 3

Bleeding is stopped by the applications of ferric chloride. This is because

  • A the blood starts flowing in opposite direction 
  • B the blood reacts and forms a solid which seals the blood vessel
  • C the blood is coagulated and thus the blood vessel is sealed
  • D the ferric chloride seals the blood vessel

Question - 4

When light comes through a hole into a room the particles of dust in air are visible because of

  • A Raman effect
  • B Zeaman effect 
  • C Tyndall effect
  • D Reflection

Question - 5

Milk is a/an

  • A Solution 
  • B gel 
  • C emulsion
  • D foam

Question - 6

Gold number is minimum in case of

  • A gelatin 
  • B egg albumin
  • C gum arabic
  • D starch

Question - 7

Gold number of a lyophilic sol is such property that 

  • A the larger its value, the greater is the peptising power
  • B the lower its value , the greater is the preptising power
  • C the lower its value, the greater is the protecting power
  • D the larger its value, the greater is the protecting power

Question - 8

Milk is a colloid in which

  • A a liquid is dispersed in liquid
  • B a solid is dispersed in liquid
  • C a gas is dispersed in liquid
  • D some agar-agar is disolved in water

Question - 9

The charge on AS2Ssol. is due to the adsorbed

  • A H+
  • B OH-
  • C O2-
  • D S2-

Question - 10

The amount of NaCl, MgCl2 and AlClrequired to coagulate a fixed amount of As2S3 sol. wil very in the order of 

  • A NaCl < MgCl2 < AlCl3
  • B NaCl > MgCl2 > AlCl3
  • C NaCl < MgCl2 > AlCl3
  • D NaCl > MgCl2 < AlCl3
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