Asked in PMC Practice Test 13 (2021) 2021

If Kp and Kc have same values, then Δn will be:

Correct answer: C. Zero

  • A. Maximum
  • B. Minimum
  • C. Zero
  • D. Negligible

Explanation

OPTION A: Maximum is incorrect because, at equilibrium, the rate of the forward and reverse reactions is equal, so there is no net change in the concentration of reactants and products.OPTION B: Minimum is incorrect for the same reason.OPTION C: If Kp = Kc and then if you have RT to the zero power, this part, basically equals 1. So, that's the reason why they're the same.OPTION D: Negligible is incorrect as ∆n is zero, not negligible

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About Reversible Reactions

A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.

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