Q48 / 180 · KCET 2013 · Chemistry

The process is spontaneous at the given temperature, if

  • A
    $\Delta H$ is +ve and $\Delta S$ is -ve
  • Correct answer
    B
    $\Delta H$ is -ve and $\Delta S$ is +ve
  • C
    $\Delta H$ is +ve and $\Delta S$ is +ve
  • D
    $\Delta H$ is +ve and $\Delta S$ is equal to zero

Solution

According to Gibbs' energy equation $\Delta G=\Delta H-T \Delta S$ when $\Delta H$ is negatie but $T \Delta S$ is positive, i.e., energy factor as well as the randomness factor favour the process. The process will be highly spontaneous and $\Delta G$ will be highly negative.

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

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