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प्रश्न
Name the process which can be used to recover salt from an aqueous salt solution.
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उत्तर
Evaporation can be used to obtain salt from an aqueous salt solution.
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संबंधित प्रश्न
Define the term matter. What is it composed of?
Explain why steel is used to make railway lines.
Name a non-metal which is a good conductor of electricity.
The three important metalloids are.............................. and ..........................
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
What is the other name for impure substances ? Give two examples of impure substances.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
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 ?
Out of a colloid, solution and a suspension :
which one has the largest particles ?
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Name the different types of solutions. Give one example of each.
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
Describe a method to separate a mixture of common salt and sand.
What is chromatography ? State its two applications.
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cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
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- How would you separate a mixture containing P, Q, R and S ?
______ is a smallest particle.
The particles in the matter are extremely small and can be seen even with a powerful microscope.
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