One Question per Day on Synthetic Ammonia (Series 51)

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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) Series 50 1. During ammonia synthesis, in order to reduce the content of ( ) in the system, a gas vent pipe is installed after ammonia separation, allowing a portion of the gas to be discharged regularly. A. NH3 B. H2 and N2 C. Inert gases D. O2 2. Flammable materials refer to substances whose lower explosive limit when mixed with air is less than (), and whose flash point is less than (). A、5%, 27°C B、10%, 28°C C、15%, 29°C D、5%, 28°C 3、The acceptable rate of the manufacturing process at the production site is generally ( )%, and only then can it be considered that the process is under control. A、90% B、100% C、95% D、98% 4、For the same reaction, the reaction rate constant is primarily related to ( ) A、temperature, solvent, catalysts, etc. B、pressure, solvent, catalysts, etc. C、temperature, pressure, solvent, etc. D、temperature, pressure, catalysts, etc. 5、In a catalyst, the component that possesses catalytic properties is ( ) A. Carrier B. Co-catalyst C. Active component D. Inhibitor Answer: CBCAC Scoring criteria: 3 points for participation, 1 point for each correct answer