In a container at equilibrium containing $\mathrm{N_2}$, $\mathrm{H_2}$, and $\mathrm{NH_3}$, if some helium gas is added, the total pressure increases, while the temperature and volume remain constant. According to Le Chatelier's principle, the dissociation of $\mathrm{NH_3}$:

  • A increases.
  • B decreases.
  • C remains unaffected.
  • D cannot be predicted.

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According to Lassa-Telier's principle, if a non-reactive gas (such as helium) is added to a gas mixture and if temperature and volume remain constant, the following effects of the incoming gas will be:

  • The total pressure will increase.
  • Since this gas does not participate in the reaction, its contribution will be neither in the amount nor in the direction of the reaction.

Therefore, it will have no effect on the dissociation of $\mathrm{NH}_{3}$.

Thus, the correct answer is:

C - Remains unaffected.

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