Question

A fine powder of chalk pieces mixed with flour cannot be separated by sieving

Answer 1

Answer:

Sieve the flour to separate any impurities in it. Now, make a fine powder of chalk pieces and mix it with the flour. Can we separate the flour and the powdered chalk by sieving? Sieving is used when components of a mixture have different sizes

Answer 2

The aggregate should be oven-dried at high temperature before sieving to prevent lump formation of the fine particles due to moisture content, which might clog the fine sieve holes.