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NEET 2026
Exam
NEET
Year
2026
Subject
Chemistry
Chapter
Chapter

NEET 2026 · Chemistry · Chapter

For which of the following reversible reactions is the relationship...

For which of the following reversible reactions is the relationship Kp=Kc(RT)−1K_p = K_c (RT)^{-1} correct?

Options

  1. AH2(g)+Cl2(g)⇌2HCl(g)\mathrm{H}_{2(g)} + \mathrm{Cl}_{2(g)} \rightleftharpoons 2\mathrm{HCl}_{(g)}
  2. BCaCO3(s)⇌CaO(s)+CO2(g)\mathrm{CaCO}_{3(s)} \rightleftharpoons \mathrm{CaO}_{(s)} + \mathrm{CO}_{2(g)}
  3. C2NO(g)+O2(g)⇌2NO2(g)2\mathrm{NO}_{(g)} + \mathrm{O}_{2(g)} \rightleftharpoons 2\mathrm{NO}_{2(g)}
  4. DN2(g)+3H2(g)⇌2NH3(g)\mathrm{N}_{2(g)} + 3\mathrm{H}_{2(g)} \rightleftharpoons 2\mathrm{NH}_{3(g)}

Correct answer

C. 2NO(g)+O2(g)⇌2NO2(g)2\mathrm{NO}_{(g)} + \mathrm{O}_{2(g)} \rightleftharpoons 2\mathrm{NO}_{2(g)}

Step-by-step solution

The relationship 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 sum of stoichiometric coefficients of gaseous products and gaseous reactants.

Given Kp=Kc(RT)−1K_p = K_c (RT)^{-1}, we require Δng=−1\Delta n_g = -1.

For H2(g)+Cl2(g)⇌2HCl(g)\mathrm{H}_{2(g)} + \mathrm{Cl}_{2(g)} \rightleftharpoons 2\mathrm{HCl}_{(g)}, Δng=2−(1+1)=0\Delta n_g = 2 - (1 + 1) = 0.

For CaCO3(s)⇌CaO(s)+CO2(g)\mathrm{CaCO}_{3(s)} \rightleftharpoons \mathrm{CaO}_{(s)} + \mathrm{CO}_{2(g)}, Δng=1−0=1\Delta n_g = 1 - 0 = 1.

For 2NO(g)+O2(g)⇌2NO2(g)2\mathrm{NO}_{(g)} + \mathrm{O}_{2(g)} \rightleftharpoons 2\mathrm{NO}_{2(g)}, Δng=2−(2+1)=−1\Delta n_g = 2 - (2 + 1) = -1.

For N2(g)+3H2(g)⇌2NH3(g)\mathrm{N}_{2(g)} + 3\mathrm{H}_{2(g)} \rightleftharpoons 2\mathrm{NH}_{3(g)}, Δng=2−(1+3)=−2\Delta n_g = 2 - (1 + 3) = -2.

Thus, the reaction 2NO(g)+O2(g)⇌2NO2(g)2\mathrm{NO}_{(g)} + \mathrm{O}_{2(g)} \rightleftharpoons 2\mathrm{NO}_{2(g)} satisfies the given relationship.

Answer: 2NO(g)+O2(g)⇌2NO2(g)2\mathrm{NO}_{(g)} + \mathrm{O}_{2(g)} \rightleftharpoons 2\mathrm{NO}_{2(g)}
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