MDCAT Chemistry MCQ #5107

In the contact process, arsenic impurities must be removed to prevent 'catalytic poisoning'. This mechanism involves which of the following?

MDCAT Chemistry MCQ #5107

  1. Question 1

    Q1. In the contact process, arsenic impurities must be removed to prevent 'catalytic poisoning'. This mechanism involves which of the following?

    • A) Preferential adsorption of impurities on the catalyst surface
    • B) Increasing the surface area of the catalyst
    • C) Changing the physical state of the catalyst
    • D) The reaction of the catalyst with the products

    Answer: Preferential adsorption of impurities on the catalyst surface

    Explanation: Poisoning occurs when the catalyst surface is blocked by impurities. Option B refers to activation, which is the opposite of poisoning.