Advertisements
Advertisements
प्रश्न
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
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.
APPEARS IN
संबंधित प्रश्न
What are molecules ?
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
What is meant by saying that metals are lustrous ?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Give reason why copper metal is used for making electric wires.
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
Which of the two will scatter light : soap solution or sugar solution ? Why ?
What is the difference between solutions and colloids ?
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
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 ?
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
All the matter made of ______.
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 |
Examples of foam are ______.
Evaporation is always accompanied by ______ in temperature.
