【Weekly Question】August 28, 2017 – September 3: Participate for +2 wealth； +3 to +10 wealth for correct answers

Thread Content

To increase the popularity of the chemical analysis section, a \"Question of the Week\" campaign has been launched to foster an active atmosphere for technical exchanges while offering rewards in the form of financial benefits to users. 【Weekly Question】Multiple-choice question: When determining the chemical oxygen demand in wastewater, in order to avoid interference from Cl-, it is necessary to add ( ) during reflux. A. Mercuric sulfate ； B、Mercuric chloride ； C、Zinc sulfate ； D. Copper sulfate. Answer: A will reply to your answer in a follow-up post; participating in the quiz earns +2 wealth points. Getting all answers correct adds another +3 to +8 wealth points. If you provide a thorough analysis and explanation of the questions or answers (or include detailed calculation processes), additional wealth rewards will be given. If your answer is correct and your analysis and explanation are accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.