Chemistry Quiz: Water in Chemical Industry

What is the main raw material used in the production of portable water?

• Ozone

• Spring water

• Activated charcoal

• Chlorine

Which step is necessary to prevent infection from mains water when dealing with spring water?

• Safety chlorination

• Flocculation

• pH adjustment

• Filtration

What is the purpose of flocculation in the water treatment process?

• Elimination of pathogenic organisms

• Removal of dissolved impurities

• Separation of undissolved solids

• Removal of inorganic and organic colloids

Which method is used for the removal of dissolved inorganic impurities like calcium carbonate?

• Filtration

• Safety chlorination

• Activated charcoal treatment

• Removal by oxidation

What is the purpose of safety chlorination in the water treatment process?

• To remove dissolved impurities

• To remove inorganic colloids

• To prevent reinfection of potable water

• To adjust the pH of the water

How is deionized water produced for high purity applications?

• Treatment with activated charcoal

• Break-point chlorination

• Flocculation

• Cation exchangers

What is the average percentage of dissolved salts in seawater?

• 0.05%

• 3.5%

• 1%

• 5%

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

• Reverse osmosis

• Filtration

• Safety chlorination

• Distillation

What is the main advantage of reverse osmosis in desalination?

• Low cost

• Ease of operation

• Small plant suitability

• High efficiency

What is added to prevent hardener precipitation in seawater desalination using distillation?

• Sulfuric acid

• Calcium hydroxide

• Polyphosphates

• Sodium chloride