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प्रश्न
Define solvent.
उत्तर
Solvent is a liquid or a medium in which the solute is dissolved.
Example: Water
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संबंधित प्रश्न
The inter-molecular force is maximum in
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Which one is a kind of matter:
Name two processes which provide the best evidence for the motion of particles in matter.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
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.
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
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 ?
How is the impurity of iron present in several substances removed in industries ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Solids possess very high kinetic energy.
Gas-solid is ______.
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
Define the term matter.
