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NEET 2026
Exam
NEET
Year
2026
Subject
Chemistry
Chapter
Chemical Equilibrium

NEET 2026 · Chemistry · Chemical Equilibrium

Given below are certain reactions. Identify the reaction for which...

Given below are certain reactions. Identify the reaction for which Kp≠KcK_p \neq K_c :

Options

  1. AH2O (g)+CO (g)⇌H2(g)+CO2(g)\text{H}_2\text{O (g)} + \text{CO (g)} \rightleftharpoons \text{H}_2\text{(g)} + \text{CO}_2\text{(g)}
  2. BN2(g)+3H2(g)⇌2NH3(g)\text{N}_2\text{(g)} + 3\text{H}_2\text{(g)} \rightleftharpoons 2\text{NH}_3\text{(g)}
  3. CH2(g)+I2(g)⇌2HI (g)\text{H}_2\text{(g)} + \text{I}_2\text{(g)} \rightleftharpoons 2\text{HI (g)}
  4. DN2(g)+O2(g)⇌2NO (g)\text{N}_2\text{(g)} + \text{O}_2\text{(g)} \rightleftharpoons 2\text{NO (g)}

Correct answer

B. N2(g)+3H2(g)⇌2NH3(g)\text{N}_2\text{(g)} + 3\text{H}_2\text{(g)} \rightleftharpoons 2\text{NH}_3\text{(g)}

Step-by-step solution

The relation between KpK_p and KcK_c is given by Kp=Kc(RT)ΔngK_p = K_c(RT)^{\Delta n_g}, where Δng\Delta n_g is the difference between the number of moles of gaseous products and gaseous reactants.

For Kp≠KcK_p \neq K_c, Δng\Delta n_g must be non-zero.

For H2O (g)+CO (g)⇌H2(g)+CO2(g)\text{H}_2\text{O (g)} + \text{CO (g)} \rightleftharpoons \text{H}_2\text{(g)} + \text{CO}_2\text{(g)}, Δng=2−2=0⇒Kp=Kc\Delta n_g = 2 - 2 = 0 \Rightarrow K_p = K_c

For N2(g)+3H2(g)⇌2NH3(g)\text{N}_2\text{(g)} + 3\text{H}_2\text{(g)} \rightleftharpoons 2\text{NH}_3\text{(g)}, Δng=2−4=−2⇒Kp≠Kc\Delta n_g = 2 - 4 = -2 \Rightarrow K_p \neq K_c

For H2(g)+I2(g)⇌2HI (g)\text{H}_2\text{(g)} + \text{I}_2\text{(g)} \rightleftharpoons 2\text{HI (g)}, Δng=2−2=0⇒Kp=Kc\Delta n_g = 2 - 2 = 0 \Rightarrow K_p = K_c

For N2(g)+O2(g)⇌2NO (g)\text{N}_2\text{(g)} + \text{O}_2\text{(g)} \rightleftharpoons 2\text{NO (g)}, Δng=2−2=0⇒Kp=Kc\Delta n_g = 2 - 2 = 0 \Rightarrow K_p = K_c

Answer: N2(g)+3H2(g)⇌2NH3(g)\text{N}_2\text{(g)} + 3\text{H}_2\text{(g)} \rightleftharpoons 2\text{NH}_3\text{(g)}
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