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प्रश्न
Define matter.
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उत्तर
Anything that has mass and occupies space is called matter.
संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
What are molecules ?
Name a non-metal which is a good conductor of electricity.
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 are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
What is the difference between solutions and colloids ?
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
Name the process by which the various gases of the air are separated.
Name the process by which all the dye can be recovered from black ink.
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
The dyes present in fountain pen ink can be separated by the technique of :
The particles in the matter are extremely small and can be seen even with a powerful microscope.
Rusting of an article made up of iron is called
Compressibility of solids: ______.
Define the term matter.
