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प्रश्न
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
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उत्तर
Iron nails are attracted by magnet. Thus, they can separated from saw dust using magnetic separation.
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संबंधित प्रश्न
What are the two conditions for the interconversion of states of matter ?
Define the following term of Atom .
What is meant by saying that metals are lustrous ?
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Name a metal which is yellow in colour.
“Is malleable and ductile” best describes :
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 ?
Define solvent.
Explain what happens when a beam of light is passed through a colloidal solution.
Define Sol and give one example.
What is the effect of temperature on the solubility of solids in liquids ?
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
What is the general name of the process by which tea-leaves are separated from prepared tea ?
Name the process by which common salt is purified.
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
How will you separate a mixture of common salt, sulphur powder and sand ?
Explain how, impure copper sulphate can be purified by crystallisation.
Which among the following is not a matter?
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
