One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； May 26th
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Single-choice question: In the conversion and production of vinyl chloride via the calcium carbide method, mercury chloride serves as a catalyst; which of the following statements is not one of its characteristics? A. The presence of a catalyst improves the efficiency with which the heat generated in a chemical reaction is utilized. B. A catalyst only reduces the time required to reach equilibrium; it does not change the equilibrium state. C. A catalyst participates in the catalytic reaction, but its chemical properties and quantity remain unchanged at the end of the reaction. D. The catalytic effect of a catalyst is selective. Answer: A. The presence of a catalyst improves the efficiency with which the heat generated in a chemical reaction is utilized
B. The catalyst only shortens the time required to reach equilibrium, but it cannot change the equilibrium state
B. The catalyst only shortens the time required to reach equilibrium, but it cannot change the equilibrium state
In the conversion and production of vinyl chloride via the calcium carbide method, mercury chloride, which serves as a catalyst, does not have the following characteristic: (b).