Water Quiz
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5 questions, one answer each
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1. Which chemical is used to test for the presence of water and turns blue when water is present?
- A. Anhydrous cobalt(II) chloride
- B. Anhydrous copper(II) sulfate
- C. Hydrated cobalt(II) chloride
- D. Anhydrous sodium chloride
2. Why is distilled water used in practical chemistry rather than water from natural sources?
- A. It boils at a higher temperature
- B. It contains fewer chemical impurities
- C. It contains more dissolved oxygen
- D. It has a higher melting point
3. Which two physical properties are used to test the purity of water?
- A. Colour and density
- B. pH and conductivity
- C. Melting point and boiling point
- D. Viscosity and surface tension
4. Water from a river contains nitrates and phosphates from fertiliser run-off. Why is this potentially harmful to aquatic life?
- A. These substances are toxic to all fish species
- B. They cause deoxygenation of water, harming aquatic organisms
- C. They increase the boiling point of water
- D. They prevent the formation of ice in winter
5. A water treatment plant treats domestic water supply using three main processes. If water contains suspended soil particles and pathogenic bacteria, which sequence of treatments would be most effective?
- A. Chlorination first, then filtration, then carbon treatment
- B. Carbon treatment first, then sedimentation and filtration, then chlorination
- C. Sedimentation and filtration first, then carbon treatment, then chlorination
- D. Chlorination and carbon treatment simultaneously, then filtration