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प्रश्न
The best evidence for the existence and movement of particles in liquids was provided by :
पर्याय
John Dalton
Ernest Rutherford
J.J. Thomson
Robert Brown
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उत्तर
Robert Brown
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संबंधित प्रश्न
Which one is a kind of matter:
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
What is meant by saying that non-metals are brittle ?
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
The property/properties which enable copper metal to be used for making electric wires is/are :
On the basis of composition of matter, milk is considered to be :
Explain what happens when a beam of light is passed through a colloidal solution.
Explain what happens when a beam of light is passed through a colloidal solution.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
What is meant by a solution?
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 ?
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 :
A mixture of kerosene and petrol can be separated by .....................
How is the impurity of iron present in several substances removed in industries ?
Pure copper sulphate can be obtained from an impure sample by the process of :
Naphthalene can be separated from sand :
Solids possess very high kinetic energy.
Liquids have ______.
Gases do not diffuse very easily.
