Chemistry · Textbook solutions

Adsorption and Colloids

Every solved example, exercise, and miscellaneous question — in the order the textbook teaches them. · 35 questions

Exercise

35 q

1. Choose the correct option.

Practice · 4
  1. Choose the correct option.
    Ex Q.1 (A)
    The size of colloidal particles lies between-
    1. A.
      10−10 m10^{-10}\ \mathrm{m} and 10−9 m10^{-9}\ \mathrm{m}
    2. B.
      10−9 m10^{-9}\ \mathrm{m} and 10−6 m10^{-6}\ \mathrm{m}
    3. C.
      10−6 m10^{-6}\ \mathrm{m} and 10−4 m10^{-4}\ \mathrm{m}
    4. D.
      10−5 m10^{-5}\ \mathrm{m} and 10−2 m10^{-2}\ \mathrm{m}
  2. Ex Q.1 (B)
    Gum in water is an example of
    1. A.
      true solution
    2. B.
      suspension
    3. C.
      lyophilic sol
    4. D.
      lyophobic sol
  3. Ex Q.1 (C)
    In Haber process of production of ammonia K2O\mathrm{K_2O} is used as
    1. A.
      catalyst
    2. B.
      inhibitor
    3. C.
      promotor
    4. D.
      adsorbate
  4. Ex Q.1 (D)
    Fruit Jam is an example of-
    1. A.
      sol
    2. B.
      gel
    3. C.
      emulsion
    4. D.
      true solution

2. Answer in one sentence :

Practice · 3
  1. Answer in one sentence :
    Ex Q.2 (A)
    Name type of adsorption in which vander Waals focres are present.
  2. Ex Q.2 (B)
    Name type of adsorption in which compound is formed.
  3. Ex Q.2 (C)
    Write an equation for Freundlich adsorption isotherm.

3. Answer the following questions:

Practice · 15
  1. Answer the following questions:
    Ex Q.3 (A)
    Define the terms: a. Inhibition b. Electrophoresis c. Catalysis.
  2. Ex Q.3 (B)
    Define adsorption. Why students can read black board written by chalks?
  3. Ex Q.3 (C)
    Write characteristics of adsorption.
  4. Ex Q.3 (D)
    Distinguish between Lyophobic and Lyophilic sols.
  5. Ex Q.3 (E)
    Identify dispersed phase and dispersion medium in the following colloidal dispersions. a. milk b. blood c. printing ink d. fog
  6. Ex Q.3 (F)
    Write notes on : a. Tyndall effect b. Brownian motion c. Types of emulsion d. Hardy-Schulze rule
  7. Ex Q.3 (G)
    Explain Electrophoresis in brief with the help of diagram. What are its applications ?
  8. Ex Q.3 (H)
    Explain why finely divided substance is more effective as adsorbent?
  9. Ex Q.3 (I)
    What is the adsorption Isotherm?
  10. Ex Q.3 (J)
    Aqueous solution of raw sugar, when passed over beds of animal charcoal, becomes colourless. Explain.
  11. Ex Q.3 (K)
    What happens when a beam of light is passed through a colloidal sol?
  12. Ex Q.3 (L)
    Mention factors affecting adsorption of gas on solids.
  13. Ex Q.3 (M)
    Give four uses of adsorption.
  14. Ex Q.3 (N)
    Explain Bredig's arc method.
  15. Ex Q.3 (O)
    Explain the term emulsions and types of emulsions.

4. Explain the following :

Practice · 2
  1. Explain the following :
    Ex Q.4 (A)
    A finely divided substance is more effective as adsorbent.
  2. Ex Q.4 (B)
    Freundlich adsorption isotherm, with the help of a graph.

5. Distinguish between the following :

Practice · 2
  1. Distinguish between the following :
    Ex Q.5 (A)
    Adsorption and absorption. Give one example.
  2. Ex Q.5 (B)
    Physisorption and chemisorption. Give one example.

6. Adsorption is surface phenomenon. Explain.

Practice · 1
  1. Ex Q.6
    Adsorption is surface phenomenon. Explain.

7. Explain how the adsorption of gas on solid varies with

Practice · 2
  1. Explain how the adsorption of gas on solid varies with
    Ex Q.7 (a)
    nature of adsorbate and adsorbent
  2. Ex Q.7 (b)
    surface area of adsorbent

8. Explain two applications of adsorption.

Practice · 1
  1. Ex Q.8
    Explain two applications of adsorption.

9. Explain micelle formation in soap solution.

Practice · 1
  1. Ex Q.9
    Explain micelle formation in soap solution.

10. Draw labelled diagrams of the following :

Practice · 4
  1. Draw labelled diagrams of the following :
    Ex Q.10 (a)
    Tyndall effect
  2. Ex Q.10 (b)
    Dialysis
  3. Ex Q.10 (c)
    Bredig's arc method
  4. Ex Q.10 (d)
    Soap micelle