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NEETChemistryChemical Equilibrium

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): For the synthesis of ammonia ( N ₂ (g) + 3 H ₂ (g) 2 NH ₃ (g) ), the numerical value of K_p is smaller than K_c at 298 K . Reason (R): K_p and K_c are related by the expression K_p = K_c(RT)^ n , where n is the difference between the total number of moles of all products and all reactants. In the l

Options

  1. ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
  2. BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. C(A) is correct but (R) is not correct
  4. D(A) is not correct but (R) is correct

Correct answer

C. (A) is correct but (R) is not correct

Step-by-step solution

Assertion (A) is correct: For the reaction N ₂ (g) + 3 H ₂ (g) 2 NH ₃ (g) , the change in gaseous moles is n_g = 2 - (1 + 3) = -2 . The relation is K_p = K_c(RT)⁻² = K_c (RT)^2 . At 298 K , the value of RT is approximately 0.0831 298 24.76 L bar K ⁻¹ mol ⁻¹ , which is significantly greater than 1 . Thus, (RT)^2 > 1 , making K_p Reason (R) is incorrect: The term n (or n_g ) in the relation K_p = K_c(RT)^ n_g specifically represents the difference between the number of moles of gaseous products and gaseous reactants,

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