Q12 / 160 · AP EAMCET 2022 (07 Jul Shift 1) · Chemistry

For the formation of $\mathrm{NH}_3(g)$ from its constituent elements, which of the relation between the reaction quotient $(Q)$ and equilibrium constant $\left(K_C^{\prime}\right)$ is correct for the backward reaction.

  • A
    $Q=K_C$
  • Correct answer
    B
    $Q>K_C$
  • C
    $Q < K_C$
  • D
    $Q=K=1$

Solution

$\mathrm{N}_2+3 \mathrm{H}_2 \rightleftharpoons 2 \mathrm{NH}_3$ For backward reaction to occur reaction quotient (Q) must be greater than equilibrium constant $\left(K_C\right)$, i.e. $Q>K_C$. This will cause conversion of product $\left(\mathrm{NH}_3\right)$ into reactants $\left(\mathrm{N}_2\right.$ and $\left.\mathrm{H}_2\right)$.

Hence, the correct answer is option: 'B'.

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