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प्रश्न
Name a metal which has a low melting point.
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उत्तर
Sodium has a low melting point.
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संबंधित प्रश्न
What are molecules ?
What are the two conditions for the interconversion of states of matter ?
All kinds of matter
Explain why air is used to inflate tyres.
Name a metal which is soft and a non-metal which is hard.
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
How would you confirm that a colourless liquid given to your is pure water ?
Name a metal which is yellow in colour.
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 ?
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
Define solubility of a substance. How does it vary with temperature ?
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.
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
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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?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
The particles in the matter are extremely small and can be seen even with a powerful microscope.
Atoms are tiny particles that repel each other when they are squeezed very close.
Solids do not flow.
