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प्रश्न
What is meant by a solution?
What do you understand by the term solution?
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उत्तर
A solution is a homogenous mixture of two or more substances, the relative proportions of which can vary within certain limits. Components of a solution are substances that mix together uniformly to form the solution.
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संबंधित प्रश्न
Define matter.
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Name a metal which is soft and a non-metal which is hard.
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Give reason why copper metal is used for making electric wires.
Name a metal which has no fixed shape.
Which one of the following is not a metalloid ?
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 ?
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
Define solubility of a substance. How does it vary with temperature ?
What is a suspension ? Give two examples of suspensions.
Write a method to separate a mixture of sand and potash alum.
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
______ is used for industrial refrigeration and transporting frozen food.
Define the term matter.
