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JEE Advanced2006ChemistryThermodynamics (C)Actual

Which is correct statement if N ₂ is added at equilibrium condition?

Options

  1. AThe equilibrium will shift to forward direction because according to IInd law of thermodynamics the entropy mu
  2. BThe condition for equilibrium is G_ N ₂ +3 G_ H ₂ =2 G_ NH ₃ where G is Gibbs free energy per mole of the gase
  3. CThe catalyst will increase the rate of forward reaction by and that of backward reaction by .
  4. DCatalyst will not alter the rate of either of the reaction.

Correct answer

B. The condition for equilibrium is G_ N ₂ +3 G_ H ₂ =2 G_ NH ₃ where G is Gibbs free energy per mole of the gase

Step-by-step solution

K_p or K_c remains constant for above reaction at constant temperature. Although in presence of catalyst rate of forward and backward reaction is increased in same order (extent) due to decreasing the activation energy of both reaction. So the equilibrium is established in short time i.e., catalyst is able to increase the concentration of reactants and products in same order, so the value of K_C or K_p remains constant. Hence equilibrium state is not effected in presence of catalyst. Hence, at equilibrium G=0 align

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