Question

Any suspended impurities in water can be removed by

• A. Sedimentation
• B. Decantation
• C. Filtration
• D. Chlorination

Answer 1

The correct option is C

Filtration

The explanation for correct option:
(C) Filtration

• Any suspended impurities in the water can be removed by filtering water through a fine muslin cloth.
• These days candle filters are used for filtration.
• Small pores in filters (muslin cloth or candle filters) blocks the path of suspended impurities and allows the water to flow.

The explanation for incorrect options:
(A) Sedimentation :

• Sedimentation is a process of settling down of the heavier particles present in a liquid mixture.
• For example, in a mixture of sand and water, sand settles down at the bottom.

(B) Decantation :

• It is defined as the separation process in which two immiscible liquids are separated.
• This is done by pouring out the clear upper layer of liquid.
• Separation of a mixture of oil from water is an example of decantation.

(D) Chlorination :

• Chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules.
• Disinfectants that are used for this purpose consist of chlorine compounds which can exchange atoms with other compounds, such as enzymes in bacteria and other cells.

Hence, option C is correct.