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प्रश्न
How will you separate camphor, common salt and iron nails from their mixture ?
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उत्तर
We will use the following methods to separate camphor, common salt and iron nails from their mixture:
Take the mixture and pour it in a beaker of water. On stirring, salt will dissolve, while iron nails and camphor will not. Fold a fluted piece of filter paper and put it on the funnel. Then filter the mixture to another beaker. The salt solution will pass through and iron filings and camphor will remain on the paper. Put the filtrate into an evaporating dish and heat it over a Bunsen burner so that the water will evaporate. Eventually, salt will be left behind. Pass the magnet over the camphor and iron filings. The magnet will attract the iron, leaving behind camphor as residue.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Gases have definite volume but no definite shape.
Describe in your own words, what happens to the particles when salt dissolves in water.
What are the characteristics of matter?
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
Give reason why copper metal is used for making electric wires.
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Define solute.
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
How is scrap iron separated from a heap of waste materials in factories?
Which of the following mixture cannot be separated by using water as the solvent ?
Explain the meaning of the term ‘matter’.
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
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 |
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The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
______ is a smallest particle.
Intermolecular space is maximum in ______.
Give an example of liquid in gas.
Define the term matter.
