【Daily Question】September 12, 2016 – Participate to earn +2 wealth； +3 to +10 wealth for correct answers

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To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched to foster an active atmosphere for technical exchanges while also providing financial rewards to users. 【Daily Question】 (Single-choice question) When using sodium oxalate as a benchmark to standardize the potassium permanganate standard solution, the reaction rate is slow at first; afterward, it increases significantly. This is due to the catalytic effect of （）。 A. Hydrogen ions B. MnO4－ C. Mn2+ D. CO2 Correct answer: C. Please reply with your answer in the comments; answering correctly earns you +2 wealth points, while getting all answers right grants an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions or answers (or include detailed calculation processes) will receive extra wealth points as a reward. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.