Advertisements
Advertisements
प्रश्न
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
Advertisements
उत्तर
We can obtain pure water from a saltwater mixture (or salt solution) by the process of distillation. Important steps underlying the process are as follows:
The salt water mixture is taken in a distillation flask and heated subsequently.
On heating, water vapours are formed that rise up and come through the side tube B.
It is then passed through condenser C.
Cold water from the tap is circulated in the outer tube of the condenser, so that the hot vapours are cooled.
The vapours condense and are collected in another beaker.
This pure water is called distilled water.
Salt, being non-volatile, remains in the flask and can be obtained later.
Separation by distillation. Here a mixture of salt and water (or salt-solution) is being separated by distillation.
APPEARS IN
संबंधित प्रश्न
Intermolecular space is maximum in .......... less in ............ and the least in .........
Liquids have definite volume but do not have definite shape.
Define matter.
The three important metalloids are.............................. and ..........................
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
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.
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.
Name the process which can be used to recover salt from an aqueous salt solution.
Describe a method to separate a mixture of common salt and sand.
How will you separate a mixture of common salt, sulphur powder and sand ?
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
One of the following does not undergo sublimation. This one is :
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
Stars including Sun are covered in ______.
Define the term matter.
