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प्रश्न
State whether the following statement is true or false :
Bread is an example of solid foam.
विकल्प
True
False
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उत्तर
True. Solid foam allows the gas to get dispersed in solid medium.
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संबंधित प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
All kinds of matter
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
Which type of elements, metals or non-metals, show the property of brittleness ?
What is meant by saying that metals are sonorous ?
What elements do the following compounds contain ?
Sugar, Common salt
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Name a metal which can be easily cut with a knife.
Draw a flow-chart for the schematic representation of different types of matter.
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
One of the following does not show Tyndall effect. This one is :
One of the following liquids will leave behind a residue on heating. This one is :
Describe a method to separate a mixture of common salt and sand.
How will you separate a mixture of iron filings and powdered carbon ?
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Define the term matter.
