One Question per Day on Synthetic Ammonia (Series 62)

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This post was last edited by penghh1985 on 2016-4-7 at 12:54. I. Multiple-choice questions (each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets). Continuing from Series 61: 151. The incorrect condition for using a filter-type gas mask is (). A. The volume concentration of oxygen is greater than 18%. B. The volume concentration of oxygen is less than 10%. C. The ambient temperature is between -30 and 45°C. D. The concentration of toxic gases is less than 1%. 152. Which of the following statements about catalysts is incorrect? A. It changes the reaction pathway. B. It reduces the activation energy of the reaction. C. It accelerates the reaction rate. D. It changes the type of reaction. 153. When conducting inspections inside the tank, maintenance personnel must wear masks. A. A long-tube mask should be worn. B. An isolated oxygen respirator should be worn. C. A filtering mask should be worn. D. None is required. 154. In chemical pipelines, those with a silver-white coating on their outer surface are used for ( ). A. Oils and flammable liquids B. Chilled water C. Air for instruments D. Gas and flammable gases 155. The main task in controlling air pollution in China at present is to control the pollution from (). A. SO2, NOx B. Particulate pollutants, Nox C. Particulate pollutants, SO2 D. SO2, heavy metal lead Answer: BDAA Scoring criteria: 3 points for participation, 1 point for each correct answer