Chemistry · Textbook solutions

Some Analytical Techniques

Every solved example, exercise, and miscellaneous question — in the order the textbook teaches them. · 23 questions

Exercise

23 q

1. Choose the correct option

Practice · 5
  1. Choose the correct option
    Ex Q.1 (A)
    Which of the following methods can be used to seperate two compounds with different solubilities in the same solvent?
    1. A.
      Fractional crystallization
    2. B.
      Crystallization
    3. C.
      Distillation
    4. D.
      Solvent extraction
  2. Ex Q.1 (B)
    Which of the following techniques is used for seperation of glycerol from soap in soap industry ?
    1. A.
      Distillation under reduced pressure
    2. B.
      Fractional distillation
    3. C.
      Filtration
    4. D.
      Crystallization
  3. Ex Q.1 (C)
    Which technique is widely used in industry to seperate components of mixture and also to purify them ?
    1. A.
      Steam distillation
    2. B.
      Chromatography
    3. C.
      Solvent extraction
    4. D.
      Filtration
  4. Ex Q.1 (D)
    A mixture of acetone and benzene can be seperated by the following method :
    1. A.
      Simple distillation
    2. B.
      Fractional distillation
    3. C.
      Distillation under reduced pressure
    4. D.
      Sublimation
  5. Ex Q.1 (E)
    Colourless components on chromatogram can not be observed by the following :
    1. A.
      Using UV light
    2. B.
      Using iodine chamber
    3. C.
      Using the spraying reagent
    4. D.
      Using infrared light

2. Answer the following

Practice · 17
  1. Answer the following
    Ex Q.2 (A)
    Which of the following techniques is used for purification of solid organic compounds? a. Crystallisation b. Distillation
  2. Ex Q.2 (B)
    What do you understand by the terms a. residue b. filtrate.
  3. Ex Q.2 (C)
    Why is a condenser used in distillation process?
  4. Ex Q.2 (D)
    Why is paper moistened before filtration?
  5. Ex Q.2 (E)
    What is the stationary phase in Paper Chromatography?
  6. Ex Q.2 (F)
    What will happen if the upper outlet of the condenser is connected to the tap instead of the lower outlet?
  7. Ex Q.2 (G)
    Give names of two materials used as stationary phase in chromatography.
  8. Ex Q.2 (H)
    Which properties of solvents are useful for solvent extraction?
  9. Ex Q.2 (I)
    Why should spotting of mixture be done above the level of mobile phase ?
  10. Ex Q.2 (J)
    Define : a. Stationary phase b. Saturated solution
  11. Ex Q.2 (K)
    What is the difference between simple distillation and fractional distillation?
  12. Ex Q.2 (L)
    Define a. Solvent extraction b. Distillation.
  13. Ex Q.2 (M)
    List the properties of solvents which make them suitable for crystallization.
  14. Ex Q.2 (N)
    Name the different types of Chromatography and explain the principles underlying them.
  15. Ex Q.2 (O)
    Why do we see bands separating in column chromatography?
  16. Ex Q.2 (P)
    How do you visualize colourless compounds after separation in TLC and Paper Chromatography?
  17. Ex Q.2 (Q)
    Compare TLC and Paper Chromatography techniques.

3. Label the diagram and explain the process in your words.

Practice · 1
  1. Ex Q.3
    Label the diagram and explain the process in your words.