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State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · Question 29

Which of the following slows down the rate of a reaction?

  1. Catalytic promoter
  2. Homogeneous catalyst
  3. Heterogeneous catalyst
  4. None of the above
Show answer & explanation

Answer: (D) None of the above

Explanation

Reactions are slowed by inhibitors (negative catalysts or poisons), not by promoters or ordinary catalysts.

  • (A) Incorrect

    Wrong: promoters increase catalyst activity.

  • (B) Incorrect

    Wrong: catalysts generally speed up reactions.

  • (C) Incorrect

    Wrong: catalysts generally speed up reactions.

  • (D) Correct

    Correct: only inhibitors/negative catalysts slow reactions, and none is listed.