3. Illustrate by a flow chart, how components of a mixture containing sawdust, iron fillings, small stones and table salt can be separated

Answer 1

We can't do flow charts on the board.
But you can do it easily with pen and paper.
Iron filings can be separated with a magnet, then a sieve can be used to separate the stones and sawdust. (The size hole in the sieve must be large enough to let the sawdust go through but small enough to catch all of the stones.) :-)