MDCAT Chemistry MCQ #2249

Phosphorus pentachloride dissociates into PCl3 and Cl2 at 250 degrees Celsius. Comparing the numerical values of Kp and Kc, which statement is true?

MDCAT Chemistry MCQ #2249

  1. Question 1

    Q1. Phosphorus pentachloride dissociates into PCl3 and Cl2 at 250 degrees Celsius. Comparing the numerical values of Kp and Kc, which statement is true?

    • A) Kp = Kc
    • B) Kp > Kc
    • C) Kp < Kc
    • D) Kp = Kc / RT

    Answer: Kp > Kc

    Explanation: Kp = Kc(RT)^delta_n; for PCl5 dissociation, delta_n is +1. Option A is wrong because it ignores the RT factor for gas moles.