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प्रश्न
Name a non-metal which is a good conductor of electricity.
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उत्तर
Graphite is a non-metal that is a good conductor of electricity.
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संबंधित प्रश्न
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
Fill in the blank
Liquids have a definite ______
Name two processes which provide the best evidence for the motion of particles in matter.
Honey is more viscous than water. Can you suggest why?
Explain why air is used to inflate tyres.
Define matter. Give four examples of matter.
What are pure substances ? Give two examples of pure substances.
Draw a flow-chart for the schematic representation of different types of matter.
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 type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Name the process which can be used to purify an impure sample of copper sulphate.
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
The dyes present in fountain pen ink can be separated by the technique of :
The most reactive metal is ______.
Atoms or groups of atoms having a charge are called ______.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Gases change to liquid by the process of ______.
Define the term matter.
