Q27 / 56 · NEST (NISER) 2011 · Chemistry

The standard equilibrium constant $K_P^{\circ}$ is positive and follows the relation
$K_P^{\circ}=\mathrm{e}^{-\Delta G^{\circ} / R T}$
Choose the correct statement(s).

  • Correct answer
    A
    $\frac{d\left(\ln K_p^{\circ}\right)}{d T}=\frac{\Delta H^{\circ}}{R T^2}$ and the sign of $\Delta H^{\circ}$ determines whether $K_P^{\circ}$ increases or decreases as T increases.
  • B
    Only the sign of $\Delta S^{\circ}$ determines the temperature dependence of $K_P^{\circ}$.
  • Correct answer
    C
    At low $T$, equilibrium position is determined by internal energy change ( $\Delta U^{\circ}$ ).
  • Correct answer
    D
    At high $T$, equilibrium position is determined by the entropy change ( $\left.\Delta S^{\circ}\right)$.

Hence, the correct answer is options: 'A', 'C', 'D'.

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