For all questions, choose the correct answer in the list and give detailed explanation justify your selection i- The impurities of dissolved gases is removed by 1. Coagulation Treatment 2. Chemical Treatment 3. Aeration Treatment 4. Adsorption Treatment ii- The hardness is usually measured by the 1. Soap Solution Test 2. Jar Test 3. Jackson Turbidimeter 4. Baylis Turbidimeter iii- Which out of the following does not help in disinfecting water? 1. Filtration 2. Chlorine tablets 3. Alums 4. Boiling