Environmental Chemistry: Water MCQs

Environmental Chemistry: Water

Which of the following is a disease in which excess of bile from the liver enters the blood and causes yellowness of skin and eyes?

cholera

dysentery

jaundice

hepatitis

Author: rikazzz Comment

Environmental Chemistry: Water

Water in swimming pools is purified by adding

sodium

chlorine

phosphorus

potassium

The most common way to purify swimming pool water is to add chlorine. Chlorine is a strong disinfectant that kills bacteria, algae, and other microorganisms. It is added to the water in liquid, tablet, or granular form. Chlorine can be effective in keeping swimming pool water clean and safe, but it is important to use it properly. Too much chlorine can irritate the skin and eyes, and it can also produce harmful byproducts.

Author: rikazzz Comment

Environmental Chemistry: Water

Permanent hardness of water is caused due to the presence of dissolved

Calcium hydrogen carbonates

Magnesium hydrogen carbonates

Calcium bicarbonate

Sulphates of magnesium

Permanent hardness of water is caused due to the presence of dissolved chlorides and sulphates of calcium and magnesium. These salts do not precipitate out of solution when the water is boiled, hence the name “permanent” hardness. Temporary hardness of water is caused due to the presence of dissolved bicarbonates of calcium and magnesium. These salts can be removed by boiling the water, as the bicarbonates will decompose into carbon dioxide and water, leaving behind the calcium and magnesium ions.

Author: rikazzz Comment

Environmental Chemistry: Water

Process in which chlorine is added to water to kill any remaining bacteria is called

sedimentation

coagulation

filtration

chlorination

Author: rikazzz Comment

Environmental Chemistry: Water

Which of the following is transmitted by fecal contamination of water or food by an encysted organism?

cholera

dysentery