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STD 11 - 6.1. Equilibrium - 1 (chemical Equilibrium) — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 6.1. Equilibrium - 1 (chemical Equilibrium)4 Marks
MCQ
$\mathrm{N}_2+3 \mathrm{H}_2 \rightleftharpoons 2 \mathrm{NH}_3$

Which is correct statement if $\mathrm{N}_2$ is added at equilibrium condition?

  • A
    The equilibrium will shift to forward direction because according to $\mathrm{II}^{\text {nd }}$ law of thermodynamics the entropy must increases in the direction of spontaneous reaction.
  • ✓
    The condition for equilibrium is $\mathrm{G}_{\mathrm{N}_2}+3 \mathrm{G}_{\mathrm{H}_2}=2 \mathrm{G}_{\mathrm{NH}_3}$ where $\mathrm{G}$ is Gibbs free energy per mole of the gaseous species measured at that partial pressure. The condition of equilibrium is unaffected by the use of catalyst, which increases the rate of both the forward and backward reactions to the same extent.
  • C
    The catalyst will increase the rate of forward reaction by $\alpha$ and that of backward reaction by $\beta$.
  • D
    Catalyst will not alter the rate of either of the reaction.
✓

Answer

Correct option: B.
The condition for equilibrium is $\mathrm{G}_{\mathrm{N}_2}+3 \mathrm{G}_{\mathrm{H}_2}=2 \mathrm{G}_{\mathrm{NH}_3}$ where $\mathrm{G}$ is Gibbs free energy per mole of the gaseous species measured at that partial pressure. The condition of equilibrium is unaffected by the use of catalyst, which increases the rate of both the forward and backward reactions to the same extent.
b

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