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प्रश्न
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
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उत्तर
Figure 81. Separation of a mixture of two miscible liquids (here alcohol and water) by fractional distillation.
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संबंधित प्रश्न
All kinds of matter
A kind of matter which can sublime is
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
Name two solid, two liquid and two gaseous elements at the room temperature.
Give reason why graphite is used for making elecrode in a dry cell.
What are the three general classes of matter ? Give one example of each type.
Which one of the following is not a metalloid ?
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 ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
How will you test whether a given solution is a colloidal solution ?
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Write a method to separate a mixture of sand and potash alum.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
Which of the following mixture cannot be separated by using water as the solvent ?
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?
The property which allows the metals to be hammered into their sheets is ______.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
