Chapter 15 - Water

Water

Quiz

 

1. What is the chemical formula of water?
   1.   H₂O₂
   2.   H₂O
   3.   HO
   4.   OH
2. Which of the following processes is used to remove hardness from water?
   1.   Boiling
   2.   Distillation
   3.   Ion exchange
   4.   Filtration
3. Hard water is characterized by the presence of which ions?
   1.   Sodium and potassium
   2.   Magnesium and calcium
   3.   Chloride and sulfate
   4.   Nitrate and phosphate
4. 
   What is the main cause of temporary hardness in water?
   
   1.   Calcium chloride
   2.   Calcium sulfate
   3.   Calcium bicarbonate
   4.   Magnesium sulfate
5. Which method is commonly used to purify drinking water on a large scale?
   1.   Boiling
   2.   Sedimentation
   3.   Chlorination
   4.   Evaporation
6. What is the boiling point of pure water at standard atmospheric pressure?
   1.   90°C
   2.   100°C
   3.   110°C
   4.   120°C
7. What is the primary use of water in industries?
   1.   Drinking
   2.   Cooling
   3.   Washing
   4.   Solvent
8. Which of the following methods can be used to remove permanent hardness from water?b
   1.   boiliing
   2.   adding limeAdding washing soda
   3.   Adding washing soda
   4.   Adding calcium carbonate
9. Adding calcium carbonate
   1.   Condensation
   2.   Freezing
   3.   Evaporation
   4.   Sublimation
10. What is the major source of fresh water on Earth?
    
    1.   Oceans
    2.   Rivers
    3.   Glaciers and ice caps
    4.   Groundwater