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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
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Explain why air is used to inflate tyres.
Name one solid, one liquid and one gaseous non-metal.
What is meant by saying that non-metals are brittle ?
Give reason why graphite is used for making elecrode in a dry cell.
Which of the following are compounds ?
- CO
- No
- NO
- Co
Define solubility of a substance. How does it vary with temperature ?
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
Name the process by which the various gases of the air are separated.
Name the process which can be used to recover salt from an aqueous salt solution.
How will you separate iron pins from sand ?
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
Explain how, nitrogen , oxygen and argon gases are separated from air.
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
Explain the meaning of the term ‘matter’.
Matter is made up of ______.
Liquids have ______.
Define the term matter.
