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One question per day, the correct answer will be rewarded with 6 wealth, and the participant will be rewarded with 2 wealth; February 17

2017-02-17View Original

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Multiple choice questions: When analyzing the purity of hydrogen chloride in the carbide method VCM conversion and synthesis process, if the solution in the absorption tube changes ( ), it proves the presence of free chlorine. The darker the color, the higher the free chlorine content. A. black B. blue C. green D. yellow answer: B. blue

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