PDF chapter test TRY NOW
1. State the importance of dissolved oxygen and carbon dioxide in water.
- Fish can survive only through the dissolved present in water.
- For photosynthesis, aquatic plants use dissolved .
- Calcium bicarbonate is formed when dissolved in water combines with limestone. Snails, oysters, and other marine species take calcium carbonate from calcium bicarbonate to form their shells.
2. What are the causes of temporary hardness and permanent hardness of water?
- Temporary hardness is due to the presence of carbonate and bicarbonate salts of and magnesium.
- Permanent hardness is due to the presence of chloride and sulphate salts of and magnesium.
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