<prompt> Maximum permissible chloride level is200 mglitre300 mglitre500 mglitre600 mglitre  <response>: 600mglitre 579- Park 19 629-Park 20th Any excess over the normal range should arouse suspicion of water contamination The standard prescribed for chloride is 200 mglitre The maximum permissible level is 600 mglitre A single tablet of chlorine 0.5gm is sufficient to disinfect 20 litre of water The principle in chlorination is to ensure a Free residual chlorine of 0, 5 mglitre at the end of one hour contact 