Chromatography

Q.

State any five methods of separating a solid-solid mixture.

Q. 1. What is chromatography?
2. Why is it named so?
3. What are the advantages of chromatography?
4. Name the simplest type of chromatography?
5. On what principle is this method based?
6. What is meant by stationary phase and mobile phase in chromatography?

Q.

In chromatography, the filter paper is the:

1. stationary phase

2. mobile phase

3. mixture

4. none of these

Q.

what is the basis of chromatography?

Q.

A mixture of ammonium chloride and sand can be separated by:

1. Decantation

2. Sublimation

3. Evaporation

4. Centrifugation

Q.

Name the process
(i) to recover dye from black ink
(ii) to get cream from milk
(iii) to separate a mixture of water and acetone
(iv) to separate a mixture of salt and iodine

Q. Tony wanted to separate the mixture of dyes constituting a sample of ink in his chemistry laboratory. He marked a line by the ink on a filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near the top of the filter paper.
What would you expect to see on the strip, if the ink contains three different coloured components?

1. Ink rises at the top of the strip.
2. One coloured spot is obtained at the middle.
3. Three different coloured spots are obtained on the strip at different heights.
4. Components cannot be distinguished.

Q. Chromatography is based on the principle of:

1. conductivity
2. distribution coefficient
3. counter balance of charges
4. centrifugal force

Q. Chromatogram is used to separate constituents of a mixture by absorbing them at different locations.

1. True
2. False

Q. The method of separating mixtures using damp paper is called:

1. photography
2. spectrography
3. chromatography
4. metallurgy

Q. State whether the following statement is true or false:

Only one method of separation can be used to separate the components of some mixtures.

Q. Chromatography can be used :

1. All of the above
2. For separating drugs from blood
3. Only for separating different colour components of a mixture
4. For separation of those solutes that dissolve in the same solvent

Q. A science teacher has drawn these diagrams showing the arrangement of the particles in three different states of water
Observe the following conversions carefully and select the correct option.

1. II: Solid, X: Cooling
2. III: Liquid, Y: Heating
3. III: Gas, X: Heating
4. I: Gas, Y: Cooling

Q. Fill up the blanks
(a) The method of separating seeds of paddy from its stalks is called ___________.
(b) When milk, cooled after boiling, is poured onto a piece of cloth the cream(malai) is left behind on it. This process of separating cream from milk is an example of ___________.
(c) Salt is obtained from seawater by the process of ___________.

Q.

21. Are the following statements true or false?

d. In some countries, seawater is purified to make it fit for human consumption.

1. True
2. False

Q. Explain Column Chromatography.

Q. Which of the following phase is present in chromatography?

1. Stationary phase
2. Mobile phase
3. Both a and b
4. None of the above

Q. An isolation technique based on differential adsorption of different constituents of a mixture would be:

1. filtration
2. chromatography
3. decantation
4. distillation

Q.

Identify the term which is not related to the method of separation of leaf pigments.

1. Distillate

2. Stationary phase

3. Mobile phase

4. Adsorption

Q. Which process is used to separate a pure solid from a solid-liquid solution?

1. Distillation
2. Chromatography
3. Filtration
4. Sublimation

Q. Trichloroethane is a solvent used to remove grease from clothes. How, after use, is the solvent separated from the grease?

1. By distillation
2. By filtration
3. By crystallisation
4. By chromatography

Q. A mixture of different coloured inks can be separated using:

1. distillation
2. filtration
3. evaporation
4. chromatography

Q. Chromatography is used for the seperation of those solute :

1. that dissolve in different solvents
2. that dissolves in the same solvent
3. that are immiscible in any solvent
4. both A and B

Q. In which of the following forms the stationery phase in chromatography should be?

1. Solid or Liquid
2. Solid or Gas
3. All the three forms
4. Liquid or Gas

Q. The different colours from an extract of green leaves can be separated by :

1. evaporation
2. distillation
3. chromatography
4. filtration

Q. Which technique is used to separate components of a solution depending on the speed in which those components move through a medium?

1. Filtration
2. Chromatography
3. Titration
4. Distillation

Q. Select the wrong statements about chromatography.

1. Moving phase is liquid and stationary phase is solid
2. Moving phase is liquid and stationary phase is liquid
3. Moving phase is solid and stationary phase is solid
4. Moving phase is solid and stationary phase is liquid

Q. A student used a pen to draw a line across a piece of chromatography paper. He then placed a sample of dye on the drawn line for analysis. What will the result of the experiment?

1. There will not be any spot in the chromatography paper
2. There will be spots of substance only
3. Ink will give the spots along with the substance
4. None of these

Q.

Define the following term:

Chromatography

Q. Which among the following is the most suitable method for the separation of dyes in black ink?

1. Sublimation
2. Distillation
3. Chromatography
4. Crystallisation