NCERT 6th Class (CBSE) Science: Separation of Substances

Question: Think and write how you will separate a mixture of water, sand, salt and iron fillings. Think- which property of iron can be used for this?

Answer: We will separate by:

1. Filtration: We will separate iron fillings and sand from mixture by filtration.
2. Magnetic separation: We will use magnet to separate iron fillings from sand.
3. Distillation: We will separate salt and water by distillation.

Question: What is mixture?

Answer: When two or more than two substances are mixed together in any ratio then it is called a mixture.

Question: Write various methods of separation of components from their mixture.

Answer:

1. Handpicking
2. Threshing
3. Winnowing
4. Sedimentation
5. Decantation
6. Filtration
7. Evaporation
8. Condensation

Question: Define the term handpicking.

Answer: The process used to separate slightly larger particles from a mixture by hand is called handpicking. For example: Stone pieces can be separated from wheat or rice by handpicking.

Question: What do you mean by threshing? Where is it used?

Answer: Threshing is a process in which we separate grain from stalks. This process is used by farmer to separate gram, wheat, rice, mustard seeds in his field.

Question: Write three methods of separation.

Answer: Handpicking, threshing and winnowing.