Water and Water Pollution Quiz

What color does anhydrous cobalt(II) chloride turn in the presence of water?

• Green

• Pink

• Blue

• Yellow

What is the boiling point of pure water?

• 100 °C

• 110 °C

• 80 °C

• 90 °C

Which of the following is a method used in water treatment?

• Filtration with sand

• Evaporation

• Sedimentation

• Both Sedimentation and Filtration with sand

What is distilled water?

• Water that has been boiled and condensed

• Water with impurities

• Water from lakes

• Water with added minerals

Which of the following substances is essential for aquatic life?

• Plastic

• Lead

• Dissolved oxygen

• Sewage

What color does anhydrous copper(II) sulfate turn in the presence of water?

• Green

• Pink

• Blue

• White

What is the first step in the water treatment process?

• Chlorination

• Filtration

• Sedimentation

• Distillation

Which of the following is a harmful substance that can be found in water?

• Magnesium

• Lead

• Calcium

• Sodium

What is the purpose of chlorination in water treatment?

• To change the color

• To kill bacteria

• To remove impurities

• To add minerals

What is the main component of NPK fertilizers?

• Nitrogen

• Carbon

• Oxygen

• Hydrogen