One Question per Day on Synthetic Ammonia (Series 64)
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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 63161: 161. When the height difference of the liquid columns in a U-tube manometer is stable, the pressures acting on the left and right sides at any cross-section within the tube are ( ). A. Equal B. Not equal C. Variable D. Indeterminable 162. The reaction between hydrogen and nitrogen to form ammonia is a （） reaction. A. Decomposition B. Displacement C. Combination D. Double displacement 163. In the batch process for producing semi-water gas, the main purpose of the （ ） stage is to remove any remaining gas from the furnace. A. Upper blowing gas once B. Air purging C. Lower blowing gas D. Upper blowing gas twice 164. Before opening the caps of bottles containing volatile liquids such as ammonia water and *ao acid in summer, the most appropriate method is ( ). A. Pry it open directly B. Hit it C. Cool it with cold water D. Slightly heat it. 165. The process of restoring a temporarily poisoned catalyst to a certain level of activity through specific treatments is known as the （） of the catalyst. A. Activation B. Combustion C. Reduction D. Regeneration Answer: ACDCD Scoring criteria: 3 points for participation, 1 point for each correct answer
161、When the difference in liquid column heights between the two tubes of a U-tube manometer is stable, the pressures acting on the left and right sides at any cross-section within the tubes are (A) equal. 162. The reaction of hydrogen and nitrogen to form ammonia is a (C, combination) reaction. 163. In the intermittent production of semi-water gas, the main purpose of the (C) downward gas injection stage is to remove any remaining gas from beneath the furnace. 164. Before opening the caps of bottles containing volatile liquids such as ammonia and *ao acid in summer, the most appropriate method is (C. cooling with cold water). 165. The process of restoring a temporarily poisoned catalyst to a certain level of activity through specific treatment methods is called the catalyst’s (D. regeneration).
Answer: A C D C D