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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
Name the terms for the change of a solid into liquid.
Name the terms for the particles of matter which may or may not have independent existence.
Name the terms for the change of vapour into a liquid.
What are molecules ?
Define the following term of Matter .
Fill in the blank
Liquids have a definite ______
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Honey is more viscous than water. Can you suggest why?
Define matter. Give four examples of matter.
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
How will you separate a mixture containing sand and sugar ?
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Diffentiate between absorption and adsorption.
Atoms are tiny particles that repel each other when they are squeezed very close.
Higher the temperature, the higher the kinetic energy of particles.
Solids do not flow.
Define the term matter.
