One Question per Day on Synthetic Ammonia (Series 70)

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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 69191: When desulfurization is carried out using tannin method, it is appropriate to maintain the pH value of the solution at ( ). A. Greater than 10 B. Less than 8.5 C. Greater than 9.2 D. 8.5–9.2 192. For a reversible exothermic reaction, as the temperature increases, the equilibrium constant ( ). A. Increase B. Decrease C. Remain unchanged D. Irrelevant. 193. In the intermittent process for producing semi-water gas, the main purpose of the （ ） stage is to remove any remaining gas from the furnace. A. Primary upward gas blowing B. Air purging C. Downward gas blowing D. Secondary upward gas blowing 194. As the circulation gas volume increases, the pressure difference in the synthesis tower ( ). A. Increase B. Decrease C. Remain unchanged D. Irrelevant 195. Increasing the pressure in ammonia synthesis affects the equilibrium ammonia content ( ). A. Increase B. Decrease C. Remain unchanged D. Irrelevant Answer: DBBAA Scoring criteria: 3 points for participation, 1 point for each correct answer