Which is the best process to separate a mixture of sand and iron filings?

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Filtration

Sedimentation

Magnetic separation

Using a compass

answer is C.

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Detailed Solution

Concept: Filtration is the process of separating particles from liquids or gases by employing a material known as a filter. Only liquids or gases can flow through the filter; solids are not allowed.
Sand and iron filings are neither liquid nor gas in this environment. As a result, this approach cannot be utilised to separate the sand and iron filings combination.
Sedimentation is the process of removing suspended materials from water using gravity. It is a physical method of water purification. It is the act of laying down sediment. Because neither sand nor iron filings are liquid, this procedure cannot be employed. As a result, none of them can commit to each other.
Magnetic separation is a procedure that separates the components of a mixture by using magnets to attract magnetic elements. When one of the components in a combination is magnetic and the other is not, this technique is utilised. Because iron fillings are magnetic and sand is not, this is the best method for separating a mixture of sand and iron fillings. Magnets will attract iron filings but will not attract sand, resulting in the separation of iron filings and sand.
Iron fillings can be used as magnets but sand is not magnetic. As a result, they may be separated using a technique that separates a mixture using a magnet. Magnetic separation is a technique that removes magnetic components from a mixture using magnetic force.
Hence, option 3 is the correct answer.

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