One Question per Day on Synthetic Ammonia (Series 5**)

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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 57: 131. Given that the reaction 2A(g) + B(g) → 2D(g) (the forward reaction is endothermic) has reached equilibrium, to reduce the rate of the forward reaction and increase the concentration of A, what measure should be taken? ( ). A. Apply pressure B. Increase temperature C. Reduce the concentration of D D. Lower temperature. 132. Which of the following is not one of the three main characteristics of catalysts? A. Activity B. Selectivity C. Stability D. Solubility 133. The pressurized shift reactor in ammonia synthesis is a ( ) gas-solid fixed-bed catalytic reactor. A. Single-stage adiabatic type B. Multi-stage adiabatic type C. Heat exchange with the outside environment type D. Self-heat exchange type 134. For chemical equipment that handles highly corrosive media, corrosion-resistant stainless steel should be used, and preferably ( ) stainless steel. A. Contains manganese B. Contains chromium and nickel C. Contains lead D. Contains titanium 135. The airtightness test of pressure vessels should be carried out in (). A. After internal and external inspections as well as weld non-destructive testing are successful B. After the pressure test is successful C. Before conducting the pressure test D. Depending on the convenience of on-site installation Answer: DDBBA Scoring criteria: 3 points for participation, 1 point for each correct answer