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ChemistryNEET 2025Law of mass action, Kc and Kp, Le Chatelier

Equilibrium

A higher yield of NO in N2(g)+O2(g)⇌2NO(g)\mathrm{N_2(g) + O_2(g) \rightleftharpoons 2NO(g)} can be obtained at [ΔH\Delta H of the reaction =+180.7 kJ mol−1= +180.7\ \mathrm{kJ\,mol^{-1}}]:

A. Higher temperature · B. Lower temperature · C. Higher concentration of N2\mathrm{N_2} · D. Higher concentration of O2\mathrm{O_2}

Choose the correct answer from the options given below:

  1. A.A, D only
  2. B.B, C only
  3. C.B, C, D only
  4. D.A, C, D only✓

Solution

The reaction is endothermic, so higher temperature shifts it forward (A). Adding either reactant also pushes it forward (C, D). Lower temperature would reduce the yield. Hence A, C and D.

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