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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 space is maximum in .......... less in ............ and the least in .........
Write true or false for each statement. Rewrite the false statement correctly.
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Name one solid, one liquid and one gaseous non-metal.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Give reason why copper metal is used for making electric wires.
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
What will happen if a saturated solution is :
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- cooled
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Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
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(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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Liquids have ______.
