Question

only A mixture contains salt, sand and pieces of copper. Which of the following separation techniques is LEAST helpful in obtaining a pure substance form the mixture? 1) Magnetic attraction 2) Filtering 3) Evaporation 4) Sieving (Eg. Sifting flour) mumhole comnosed of one or two letters. The​

Answer 1

Answer:

3) Evaporation is the least useful.