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प्रश्न
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
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उत्तर
The method for separating a mixture of iron filings and sulphur powder, employs the use of carbon disulphide as a solvent followed by filtration and evaporation.
Sulphur dissolves in carbon disulphide, whereas iron does not. So, the solution will contain undissolved iron in it. This can then be filtered using a filter paper, where iron remains as residue and is collected on the filter paper. The filtrate obtained contains sulphur dissolved in it. On evaporating the solvent of the filtrate, we obtain sulphur.
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संबंधित प्रश्न
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
What is the other name for impure substances ? Give two examples of impure substances.
Give reason why copper metal is used for making electric wires.
State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
Draw a flow-chart for the schematic representation of different types of matter.
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
Which of the following does not have a fixed melting point/boiling point ?
State whether colloidal solutions are homogeneous or heterogeneous.
Name the different types of solutions. Give one example of each.
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
What is the difference between colloids and suspensions ?
Name the process by which common salt is purified.
How would you separate iodine from a mixture of iodine and common salt ?
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
Name one pair of liquids which can be separated by using a separating funnel.
Stars including Sun are covered in ______.
The most reactive metal is ______.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
