MDCAT Chemistry MCQ #2230

Increasing the pressure of a reaction vessel shifts the equilibrium of N2 + 3H2 ⇌ 2NH3 but has no effect on H2 + I2 ⇌ 2HI because:

MDCAT Chemistry MCQ #2230

  1. Question 1

    Q1. Increasing the pressure of a reaction vessel shifts the equilibrium of N2 + 3H2 ⇌ 2NH3 but has no effect on H2 + I2 ⇌ 2HI because:

    • A) The HI reaction involves no change in the number of gaseous moles
    • B) The HI reaction is faster than the ammonia synthesis
    • C) Ammonia synthesis is an endothermic process
    • D) Hydrogen acts as a catalyst in the HI reaction

    Answer: The HI reaction involves no change in the number of gaseous moles

    Explanation: Pressure shifts equilibrium toward the side with fewer moles; reactions with equal moles on both sides remain unaffected by pressure changes.