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प्रश्न
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
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उत्तर
Both air and bromine vapour are made up of tiny moving particles, which collide with each other and bounce about in all directions due to which both the gas particles mix uniformly. This is an example of diffusion.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Gases have definite volume but no definite shape.
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
What is the scientific name of particles which make up mater?
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
The property/properties which enable copper metal to be used for making electric wires is/are :
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 ?
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
One of the following does not show Tyndall effect. This one is :
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
Name the process which can be used to purify an impure sample of copper sulphate.
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
Explain how, nitrogen , oxygen and argon gases are separated from air.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
Gases do not diffuse very easily.
Define the term matter.
