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प्रश्न
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
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उत्तर
Crystallization is a better than evaporation for recovering sugar from sugar solution. During evaporation, sugar can get charred on heating. However, in crystallization, no such problem occurs and we can get pure crystals of sugar.
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संबंधित प्रश्न
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
All kinds of matter
What are the conditions for 'something' to be called 'matter'?
Name two processes which provide the best evidence for the motion of particles in matter.
Name the property which allows metals to be hammered into thin sheets.
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
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
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 blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
How is scrap iron separated from a heap of waste materials in factories?
Which of the following mixture cannot be separated by using water as the solvent ?
Which among the following ______ will get attracted to by magnet?
Why wires cannot be drawn from materials such as stone or wood?
Diffentiate between absorption and adsorption.
Stars including Sun are covered in ______.
A standard sheet of paper is about ______ of atoms thick
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
The movement of particles in liquids is ______.
Define the term matter.
