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प्रश्न
What is chromatography ? State its two applications.
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उत्तर
Chromatography is a technique used for separating two or more dissolved solids, which are present in the solution in small quantities.
Separation is based on the fact that two or more substances are soluble in the solvent but their solubility is different.
This technique has various important applications:
- To separate dyes present in black ink
- It is used in forensic science to detect and identify the trace amounts of poison present in the stomach.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Liquids have definite shape and definite volume.
What are the two conditions for the interconversion of states of matter ?
Which one is a kind of matter:
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Name a liquid which can be classified as a pure substance and conducts electricity.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Define solvent.
What is the effect of temperature on the solubility of solids in liquids ?
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Diffentiate between absorption and adsorption.
Stars including Sun are covered in ______.
Higher the temperature, the higher the kinetic energy of particles.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Compressibility of solids: ______.
