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प्रश्न
How will you separate a mixture of sodium chloride and sand ?
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उत्तर
Two processes are involved in separation of sodium chloride and sand, i.e., filtration followed by evaporation. The mixture of sodium chloride and sand can be separated by the following method:
- Take the mixture of sodium chloride and sand in a china dish. Pour some water in the mixture of sodium chloride and sand.
- After few seconds, all the sodium chloride will dissolve in water but sand will not.
- Then pour the contents of the container in a funnel fitted with a filter paper.
- Sand remains on the paper as residue and sodium chloride dissolved in water passes through it to the funnel.
- Now put the salt solution of the funnel on heat. Water starts getting evaporated leaving salt as residue in the funnel.
- Remove the funnel from heat.
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संबंधित प्रश्न
Classify each of the following as a homogeneous or heterogeneous mixture.
Soda water, wood, air, soil, vinegar, filtered tea.
Compare the properties of metals and non-metals with respect to
- alleability
- ductility
- electrical conductivity.
Classify the following materials as homogeneous mixtures and heterogeneous mixtures :
Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.
Which of the following is not a mixture ?
Name any two solid substances whose mixture can be separated by sublimation.
Give two examples of the following type of mixture.
gas-gas
Write “true” or “false” for the following statement
A pure substance consists of only one kind of atom or molecule.
Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
Name the process associated with the following
Settling of sand when a mixture of sand and water is left undisturbed for some time.
Air is a ______.
