Question

Water containing high salt concentration can be purified by
A)Boiling
B)UV Radiation
C)Filtration
D)Reverse osmosis

Answer 1

Water is very essential for the human body. Upto $60\%$ of the human body consists of water. All of our cells, organs and tissues use water to help with temperature regulation, keeping hydrated and smoothly carrying out bodily functions.Apart from that water also acts as a lubricant and cushions the joints joints.The molecular formula of water is ${H_2}O$ .It has a $pH$ of $7$ and it appears as a colourless liquid.

Complete answer:
Apart from its biological importance water is also essential to many industries.In Fact water serves as the base products for industries like beverage,dairy,chemicals,pharmaceuticals etc.Thus it’s very clear that water is a very important resource and it needs to properly utilised.However obtaining clean drinking water has always been a matter of great concern.Out of all the water available on the earth only $2.5\%$ water is fit for drinking.Due factors like pollution,contamination water needs to be purified before being considered for human consumption.There are various ways in which water can be purified
1)Boiling
2)UV Radiation
3)Filtration
4)Reverse osmosis
5)Distillation
6)Sedimentation
Whenever water is contaminated with high levels of salt,the best way to purify it is by Reverse osmosis.This also helps us in making the water free from any microbes or metal traces.
Hence the correct option is (D).

Note:
Reverse osmosis (RO) is a purification process in which a partially permeable membrane is used to separate ions, unwanted molecules and larger particles from water thus making it safe for drinking.This process is widely used in industries at the same time portable RO filters have made their way to people’s home.