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प्रश्न
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
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उत्तर
This statement means that 20.7 gm of copper sulphate can be dissolved in 100 gm of water at 20°C.
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संबंधित प्रश्न
Name a non-metal which is a good conductor of electricity.
The three important metalloids are.............................. and ..........................
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
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 ?
Define Aerosol Give one example.
What is meant by a solution?
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
Write a method to separate a mixture of sand and potash alum.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Which one of the following scrap metal cannot be separated by magnetic separation ?
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.
Explain the meaning of the term ‘matter’.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
All the matter made of ______.
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 |
Give some examples of the Tyndall effect observed in your surroundings?
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
