One Question per Day on Synthetic Ammonia (Series 4**)

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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 47, 236: Changing the proportion of water vapor is the main method of regulation in the ammonia synthesis shift reaction. Which of the following statements is incorrect? () A. Increasing the amount of water vapor helps to reduce the residual content of CO. B. Changing the amount of water vapor is an effective way to regulate the temperature of the bed layer. C. The greater the amount of water vapor, the better. D. An excess of water vapor helps to prevent ferric oxide in the catalyst from being reduced. 237. Which of the following gases is toxic to the human body? A. CO B. N2 C. H2 D. CO2 238. The carrier is a component unique to solid catalysts; carriers generally have the characteristics of ( ). A. Large crystals, small surface area, porous structure B. Small crystals, small surface area, porous structure C. Large crystals, large surface area, porous structure D. Small crystals, large surface area, porous structure 239. The readings from the pressure gauges at the inlet and outlet of a device are 23 mmHg (vacuum) and 67 kPa (gauge pressure), respectively. Then the absolute pressure difference between the inlet and outlet is ( ) kPa. A、64 B、70 C、0 D、60. 24. During ammonia synthesis, the presence of inert gases reduces the partial pressures of H2 and N2 gases; this has an effect on the reaction as follows: A. It is favorable for equilibrium but unfavorable for the reaction rate. B. It is unfavorable for equilibrium but favorable for the reaction rate. C. It is unfavorable for both equilibrium and the reaction rate. D. It is favorable for both equilibrium and the reaction rate. Answer: C. A, D, B, D. Scoring criteria: 3 points for participation, 1 point for each correct answer, and 1 additional point if the answer is kept hidden. It should be specifically noted that, in order to help everyone remember the practice of hiding answers, starting with this daily question, requests will occasionally appear asking respondents to hide their answers. If the answerer is not hidden, they must participate in scoring. For methods to hide posts, see: http://bbs.hcbbs.com/thread-1551107-1-1.html