Q1 / 110 · VITEEE 2022 · Chemistry

Identify the correct statement for change of Gibbs energy for a system \(\left(\Delta \mathrm{G}_{\text {system }}\right)\) at constant temperature and pressure :

  • Correct answer
    A
    If \(\Delta \mathrm{G}_{\text {system }}=0\), the system has attained equilibrium
  • B
    If \(\Delta \mathrm{G}_{\text {system }}=0\), the system is still moving in a particular direction
  • C
    If \(\Delta \mathrm{G}_{\text {system }} < 0\), the process is not spontaneous
  • D
    If \(\Delta \mathrm{G}_{\text {system }} > 0\), the process is not spontaneous

Solution

If \(\Delta \mathrm{G}_{\text {system }}=0\) the system has attained equilibrium is right choice. In it alternative (d) is most confusing as when \(\Delta \mathrm{G} > 0\), the process may be spontaneous when it is coupled with a reaction which has \(\Delta \mathrm{G} < 0\) and total \(\Delta \mathrm{G}\) is negative, so right answer is (a).

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

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