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प्रश्न
State two physical properties on the basis of which metals can be distinguished from non-metals.
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उत्तर
| Properties | Metals | Non-metals |
| Lustre | Lustrous | Non-lustrous |
| Heat and electrical conductivity | Good conductor | Poor conductor |
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संबंधित प्रश्न
Intermolecular force of attraction 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 |
The molecules can move freely anywhere in
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
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Matter cannot exist in different states.
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Choose the correct answer.
A 5 per cent sugar solution means that :
Define solute.
Define solvent.
How will you differentiate between a suspension and a colloid ?
What will happen if a saturated solution is :
- heated
- cooled
Which of the following cannot be separated from air by the process of fractional distillation ?
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
What's the solution?
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What is the difference between a substance and an object?
Liquids cannot be compressed and they have fixed volume.
