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प्रश्न
State whether the following statement is true or false :
Sponge is an example of solid sol.
उत्तर
False. Sponge is an example of solid foam.
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संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Name two processes which provide the best evidence for the motion of particles in matter.
Define matter. Give four examples of matter.
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
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 ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
State whether the following statement is true or false :
Bread is an example of solid foam.
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Name the process by which common salt is purified.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
One of the following does not undergo sublimation. This one is :
Explain the meaning of the term ‘matter’.
The particles in the matter are extremely small and can be seen even with a powerful microscope.
Higher the temperature, the higher the kinetic energy of particles.
