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NEET2026Chemistry-Relation between Kₚ and Kc

NEET 2026 Chemistry Relation between Kₚ and Kc MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Given below are certain reactions. Identify the reaction for which Kₚ ≠ Kc.

A

H₂O(g) + CO(g) ⇌ H₂(g) + CO₂(g)

B

N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

C

H₂(g) + I₂(g) ⇌ 2HI(g)

D

N₂(g) + O₂(g) ⇌ 2NO(g)

Correct Answer

Option B

Detailed Explanation

Topic: Chemical Equilibrium → KpK_p and KcK_c Difficulty: 🟡 Medium

✅ Ans: B

Relation:

Kp=Kc(RT)Δn\boxed{K_p=K_c(RT)^{\Delta n}}

For:

N2(g)+3H2(g)⇌2NH3(g)N_2(g)+3H_2(g)\rightleftharpoons2NH_3(g) Δn=2−(1+3)=−2\Delta n=2-(1+3)=\boxed{-2}

Since Δneq0\Delta n eq0,

KpeqKc\boxed{K_p eq K_c}

❌ Why others are wrong?

  • A: Δn=2−2=0\Delta n=2-2=0 ❌
  • C: Δn=2−2=0\Delta n=2-2=0 ❌
  • D: Δn=2−2=0\Delta n=2-2=0 ❌

🧠 NEET Trick: Count only gaseous moles.

Δn=0⇒Kp=Kc\boxed{\Delta n=0\Rightarrow K_p=K_c} Δneq0⇒KpeqKc\boxed{\Delta n eq0\Rightarrow K_p eq K_c}

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