Answer:

1. heterogeneous mixture

2. The components of a mixture are the items that are mixed together. This can include a wide variety of substances. For example, a combination of sugar and water

3. By using other kinds of method such as evaporation, distillation and  filtration. Evaporation is a technique used to separate out homogeneous mixtures that contain one or more dissolved salts. Distillation is a physical separation based on the vaporization of the different components of the mixture to be separated. Filtration is a method for separating an insoluble solid from a liquid.

4. To separate sand and salt, we dissolve the mixture in water and then filter it. In this way salt get dissolved in water while sand we get as residue. Thus, we can say handpicking is used for separating slightly larger sized impurities such as pieces of dirt, stones, husk from wheat, rice, pulses etc.

Explanation: