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प्रश्न
The best evidence for the existence and movement of particles in liquids was provided by :
विकल्प
John Dalton
Ernest Rutherford
J.J. Thomson
Robert Brown
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उत्तर
Robert Brown
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संबंधित प्रश्न
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
The inter-molecular force is maximum in
Which one is a kind of matter:
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Honey is more viscous than water. Can you suggest why?
Name a non-metal which is a good conductor of electricity.
Name two solid, two liquid and two gaseous elements at the room temperature.
Name a metal which has a low melting point.
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
Name the process which can be used to purify an impure sample of copper sulphate.
A standard sheet of paper is about ______ of atoms thick
Rusting of an article made up of iron is called
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Intermolecular space is maximum in ______.
Evaporation does form bubbles.
Examples of foam are ______.
Define the term matter.
