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Answer:
1)) To separate the useful components from the non-useful or some harmful components.
2) It is used to separate the heavier and lighter components of a mixture by wind or by blowing air. ... As the mixture falls down, lighter husk is taken away by blowing air and the heavier grain seeds fall down to make a heap.
3) It uses sieve plates for separation of coarse particles from finer particles. Wheat flour is separated from wheat bran by the method of sieving.
4) This is because the particles of the insoluble solid would remain in the filtering device if they are bigger than the holes of the filtering device, and the filtered substance will pass through the holes and get separated.
5) When dissolving salt in water, the movement of and collision between the salt and water particles causes the particles to break apart. Neither salt nor water particles are destroyed. When the water evaporates from a mixture of salt and water, all of the original salt particles will remain.
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In Question 2&3 you can define it
