Question

Sea/ocean water cannot be used for domestic use because it contains:
(A) Soluble salts
(B) Dust particles
(C) Insoluble salts
(D) Acids

Answer 1

Sea/Ocean water is a mixture of $96.5\%$ water, $2.5\%$ salts, and smaller amounts of other substances, including dissolved organic and inorganic materials, particulate matter, and a few gases.

Complete step by step solution:
Seawater or ocean water contains different dissolved salts and other chemicals. Having saltwater can be dangerous to humans because the human body is unable to get rid of the excess amount of salt that enters the body along with the seawater. The body generally gets rid of the impurities and the salts from the kidneys in the form of urine, but it requires them to be in the dilute form for the proper functioning of the kidneys. Normally that is not a problem as we always drink freshwater and foods that are low or moderate in the salt content. The body tissues also contain freshwater with normal salinity. But when there is too much salt in our bodies, the kidneys cannot get enough freshwater to dilute the high amount of salt and as a result, the kidneys will fail.
So the correct answer is option A.

Note:
Saline water is referred to as that water which contains significant concentrations of salts, among which the most common one is sodium chloride or rock salt. In this case the concentration of the salt is expressed in parts per million or ppm. Fresh water has salinity content below 1000 ppm, while the salinity content of seawater is higher than 35,000 ppm.