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प्रश्न
The dyes present in fountain pen ink can be separated by the technique of :
विकल्प
fractional distillation
infrared photography
crystallisation
chromatography
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उत्तर
chromatography
Chromatography is the technique used to separate the contents of a mixture, where solute particles are in extremely small quantity.
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संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Fill in the blank :
The substances which can flow are called ________
What are molecules ?
State two characteristics of matter demonstrated by Brownian motion.
What is meant by saying that metals are sonorous ?
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
The property/properties which enable copper metal to be used for making electric wires is/are :
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
State whether the following statement is true or false :
Sponge is an example of solid sol.
How will you test whether a given solution is a colloidal solution ?
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Name the process which can be used to purify an impure sample of copper sulphate.
How will you separate a mixture containing sand and sugar ?
How would you separate iodine from a mixture of iodine and common salt ?
How will you separate iron pins from sand ?
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Wipe the board with a duster and then tap the duster against the table. What do you see?
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Intermolecular space is maximum in ______.
