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प्रश्न
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
उत्तर
The gases of air can be separated by fractional distillation of liquid air because they have different boiling points.
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संबंधित प्रश्न
The inter-molecular force is maximum in
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
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 ?
Explain what happens when a beam of light is passed through a colloidal solution.
Define Sol and give one example.
What is a colloid ? Give two examples of colloids (or colloidal solutions)
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
Describe a method to separate a mixture of common salt and sand.
How is cream separated from milk ?
What is chromatography ? State its two applications.
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
The physical state of water at 373 K is ______.
A teabag placed in a cup of hot water will diffuse into the water.
Define the term matter.
Define the term matter.
