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JEE Main201912 Apr 2019Evening ShiftChemistryChemical EquilibriumActual

In which one of the following equilibria, K p ≠ K c ?

Options

  1. A2 H I g ⇌ H 2 g + I 2 g
  2. B2 C s + O 2 g ⇌ 2 C O g
  3. C2 N O g ⇌ N 2 g + O 2 g
  4. DN O 2 g + S O 2 g ⇌ N O g + S O 3 g

Correct answer

B. 2 C s + O 2 g ⇌ 2 C O g

Step-by-step solution

k p = k c R T Δ n g     ( i )   2 HI g ⇌ H 2 g + I 2 g Δ n g = 1 + 1 - 2 = 0 S o       k p = k c (ii) 2 N O g ⇌ N 2 g + O 2 g Δ n g = 2 - 2 = 0 S o       k p = k c (iii) N O 2 g + S O 2 g ⇌ N O g + S O 3 g Δ n g = 2 - 2 = 0 S o       k p = k c (iv) 2 s + O 2 g ⇌ 2 C O g Δ n g = 2 - 1 = 1 k p = k c RT Δ n ⇒ k p = k c RT k p > k c

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