Question

Which of the following mixtures can be separated by magnetic separation?
A.Iron fillings, sand and iodine
B.Common salt, sand and marbles
C.Chalk powder, grain and chaff
D.Stone, salt and water.

Answer 1

Hint:The one with the magnetic property is attracted by magnets. Look at the given mixtures and the one that contains at least one magnetic material will be separated by magnetic separation.

Complete step by step solution:
In the Magnetic separation method there is one substance which has magnetic properties, in a mixture then this method is really helpful. Strong magnets are used to separate the magnetic materials.
The mixture of iron filling sand and iodine can be very well separated using magnetic separation because as we know iron is a magnetic material and will be attracted by magnet The mixture of iodine and salt are not attracted by magnet.
Common salt, sand and marble can easily be separated by hand making method. Marble can be removed by hand picking method and sand and salt can be removed by dissolving the solution in water. The salt will dissolve in water and the sand and will remain undissolved. So we filter to get sand and then boil the water to get salt.
Winnowing can be done to remove grain and laugh and then filtration can be used to separate chalk powder.Similarly in case of stone salt and water and can be used to separate stone and filtration and evaporation can be used for salt and water solution.

Hence, the correct option is A.

Note:
Most of the substances we see are not in pure form. They are Present in a mixture. To get the substances in pure form we use the methods of separation. There are various methods of separation such as hand picking, threshing, winnowing, sieving, evaporation, distillation, filtration, separating funnel and magnetic separation.