Question

The liquid waste which has dissolved and suspended impurities is-
A.Sludge
B.Sewage water
C.Potable water
D.None of the above

Answer 1

Hint: We have to know that the suspended impurities are the suspended solid and that impurities are not completely soluble in water. The impurities are present in the water in the form of particles. And these particles may cause the visible turbidity to the water and it may lead to the coagulation. The suspended particles can be eliminated by using any of the physical methods. The solid particles may include rust, sand, clay and dust. These particles remain suspended in the water and this is the reason behind the water becoming muddy.

Complete answer:
We need to remember that the sludge is the sedimentary deposit and it is a water formed with suspended solids. And it contains the water and the trace elements. It will reduce the efficiency of heat. But there are no suspended impurities present in sludge. Hence, option (A) is incorrect.
The sewage is a liquid waste from households and pre-treated industrial waste waters etc. There are so many biological, physical and chemical methods used to remove the impurities present in the waste water. Because, the sewage water causes soil pollution and water pollution. The suspended impurities and dissolved impurities are present in the sewage water and these impurities are known as contaminants. Therefore, the liquid waste which has dissolved and suspended impurities is sewage water. The sewage is a mixture of chemical complexes and all the chemicals have different chemical characteristics and properties. Hence, option (B) is correct.
The potable water is safe and it can be drunk by humans. Because, it does not contain any suspended impurities and liquid waste. Hence, option (C) incorrect.
The liquid waste which has dissolved and suspended impurities is sewage water. Hence, option (D) is incorrect.

Hence, option (B) is correct.

Note:
We need to remember that the suspended impurities do not have two essentials of pure water and that is, oxygen and hydrogen. If the hydrogen and oxygen is present in the water, it can enable us to drink. Because, it is pure and normally dissolves most anything. The impurities can be removed by different methods like filtration. While filtration, the suspended particles will be trapped in the pore spaces of the filter media.