Chemistry Quiz: Water in Chemical Industry

Which of the following is a necessary step to obtain potable water?

• D. Filtration

• C. pH adjustment

• B. Safety chlorination

• A. Sedimentation

What is the advantage of ozonization over chlorination in water treatment?

• A. Lower costs

• B. Formation of organochloro-compounds

• C. Elimination of pathogenic organisms

• D. Subsequent flocculation made easier

What is the purpose of flocculation in water treatment?

• C. Removal of inorganic and organic colloids

• B. Elimination of pathogenic organisms

• A. Removal of dissolved inorganic impurities

• D. Safety chlorination

How is filtration carried out in water treatment?

• C. Downwards through a sand filter

• A. Upwards through a sand filter

• D. Using a single-layer filter

• B. Flushing with air

What is the purpose of activated charcoal treatment in water purification?

• A. Removal of iron and manganese ions

• B. Decomposition of excess chlorine

• D. Adsorption of nonionic organic impurities

• C. Elimination of pathogenic organisms

Why is safety chlorination carried out after water treatment?

• B. To remove dissolved inorganic impurities

• A. To prevent reinfection of potable water

• C. To eliminate pathogenic organisms

• D. To adjust the pH of the water

What is the purpose of cation exchangers in the production of soft or deionized water?

• D. Removal of ions for high purity water

• C. Treatment of water with activated charcoal

• B. Elimination of pathogenic organisms

• A. Removal of dissolved inorganic impurities

What is the average percentage of dissolved salts in seawater?

• B. 3.5%

• A. 0.05%

• D. 1%

• C. 0.1%

Which process is mainly used for the production of potable water from seawater?

• D. Chlorination

• C. Flocculation

• B. Filtration

• A. Distillation

What is the purpose of polyphosphates in reverse osmosis desalination plants?

• C. Elimination of pathogenic organisms

• D. Treatment of water with activated charcoal

• B. Stabilization of hardeners

• A. Removal of dissolved inorganic impurities