Which of the following statements about water are correct? 1. Household water has dissolved salts. 2. Water intended for household use is filtered to remove soluble impurities. 3. Chlorine is added to water to kill bacteria. 4. Water is used in industry for cooling.
- A1, 2, 3 and 4
- B1, 2 and 3 only
- C1, 3 and 4 only
- D2, 3 and 4 only