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प्रश्न
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
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उत्तर
Metals: Mercury, sodium, magnesium, copper
Non-metals: Diamond, sulphur, iodine, carbon, helium
Metalloids: Arsenic, germanium, boron
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संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Define the following term of Matter .
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
What are the two types of pure substances? Give one example of each type.
Give reason why graphite is used for making elecrode in a dry cell.
The elements which normally exist in the liquid state are :
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
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Sponge is an example of solid sol.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
One of the following does not show Tyndall effect. This one is :
Name the source from which nitrogen and oxygen are obtained on a large scale.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
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State whether true or false. If false, correct the statement.
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Solid is an arrangement of particles ______.
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Define the term matter.
