Basic Analytical Techniques
Chapter 3: Basic Analytical Techniques
- Which of the following analytical techniques cannot be used for colourless compounds?
- O. Why do we see bands separating in column chromatography? we see bands separating in column chromatography Because , In column chromatography, the solutes get adsorbed on the stationary phase, they... 1
- N. Name the different types of Chromatography and explain the principles underlying them. There are two types of chromatography namely: Liquid chromatography ⇒ separate ions that are dissolved insolvent Gas chromatography ⇒ separa... 2
- M. List the properties of solvents which make them suitable for crystallization The properties of solvents which make them suitable for crystallization are The compound to be crystallized should be least or sparingly sol... 1
- L. Define a. Solvent extraction b. Distillation. Solvent extraction : it is ultimately a process of partitioning between two immiscible solvents, and for its optimization, it is necessary t... 2
- K. What is the difference between simple distillation and fractional distillation? Distillation Fraction distillation Simple distillation is used to separate liquids with boiling point gaps of at least 50 degrees. Fractiona... 1
- J. Define : a. Stationary phase b. Saturated solution Statioanry phase - Stationary phase and mobile phase arr terms related to chromatography. Phase on which the materials to be separated are s... 1
- I. Why should spotting of mixture be done above the level of mobile phase ? In thin-layer chromatography( TLC), the sample mixture should be spotted above the solvent level. It is because if the mixture gets in conta... 1
- H. Which properties of solvents are useful for solvent extraction? Organic compound must be more soluble in the organic solvent, than in water. Solvent should be immiscible with water and be able to form two... 1
- G. Give names of two materials used as stationary phase in chromatography. names of two materials used as stationary phase in chromatography. alumina silica gel 1
- F. What will happen if the upper outlet of the condenser is connected to the tap instead of the lower outlet? It is necessary to cool the condenser with cool water for proper functioning of condenser. If tap is connected to the upper outlet then jack... 2
- E. What is the stationary phase in Paper Chromatography? Paper chromatography is a type of partition chromatography in which a special quality paper, namely Whatman paper 1 is used. The water trapp... 1
- D. Why is paper moistened before filtration? The filter paper is moistened Before filtration with an appropriate solvent to ensure that it sticks to the funnel and does not let the air... 1
- C. Why is a condenser used in distillation process? Condensers are often used in reflux, where the hot solvent vapors of a liquid being heated are cooled and allowed to drip back. Condensers a... 1
- B. What do you understand by the terms a. residue b. filtrate. Residue: In the process of filtration, the insoluble (undissolved) impurities which remain on the filter paper are called the residue. Filtr... 1
- A. Which of the following techniques is used for purification of solid organic compounds? (a) Crystallization Crystallization is used for purification of solid organic compound. In this technique, substances are dissolved in the h... 1
- E. Colourless components on chromatogram can not be observed by the following : d. Using infrared light 2
- D. A mixture of acetone and benzene can be seperated by the following method : b. Fractional distillation 2
- C. Which technique is widely used in industry to seperate components of mixture and also to purify them ? b. Chromatography 2
- B. Which of the following techniques is used for seperation of glycerol from soap in soap industry ? a. Distillation under reduced pressure 2
- A. Which of the following methods can be used to seperate two compounds with different solubilities in the same solvent? a. Fractional crystallization 2