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प्रश्न
Define the emulsion. Give one example.
Define emulsion and give an example.
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उत्तर
An emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid which is not miscible with it. Examples are milk and butter.
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संबंधित प्रश्न
Liquids have definite shape and definite volume.
What are molecules ?
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
The best evidence for the existence and movement of particles in liquids was provided by :
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
The three important metalloids are.............................. and ..........................
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
The elements which normally exist in the liquid state are :
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
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 ?
Name the different types of solutions. Give one example of each.
Name the process you would use to separate a mixture of water and alcohol.
How is the impurity of iron present in several substances removed in industries ?
Explain how, impure copper sulphate can be purified by crystallisation.
Naphthalene can be separated from sand :
A standard sheet of paper is about ______ of atoms thick
Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
Rusting of an article made up of iron is called
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
The physical state of water at 373 K is ______.
