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प्रश्न
Name the process by which the various gases of the air are separated.
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उत्तर
Various gases of air are separated by fractional distillation.
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Which one is a kind of matter:
Define matter. Give four examples of matter.
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Give reason why graphite is used for making elecrode in a dry cell.
Name a metal which forms amalgams.
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
What is the difference between solutions and colloids ?
Define Foam Give one example.
Name the process which can be used to recover salt from an aqueous salt solution.
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
Describe a method to separate a mixture of camphor and sand.
Naphthalene can be separated from sand :
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
______ is a smallest particle.
The fluidity of solids: ______.
Give an example of a molecule.
