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प्रश्न
State whether the following statement is true or false :
Sponge is an example of solid sol.
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उत्तर
False. Sponge is an example of solid foam.
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संबंधित प्रश्न
Intermolecular space is maximum in .......... less in ............ and the least in .........
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 |
Name the terms for the particles of matter which may or may not have independent existence.
What is the scientific name of particles which make up mater?
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
What is meant by saying that metals are malleable and ductile?
What is meant by saying that metals are lustrous ?
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 ?
Define Sol and give one example.
How will you separate iron pins from sand ?
How will you separate a mixture of common salt, sulphur powder and sand ?
Pure copper sulphate can be obtained from an impure sample by the process of :
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Wipe the board with a duster and then tap the duster against the table. What do you see?
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?
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
 |
 |
 |
The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
Atoms or groups of atoms having a charge are called ______.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
