Q8 / 155 · WBJEE 2021 · Chemistry

For a spontaneous reaction at all temperatures which of the following is correct?

  • A
    Both $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ are positive
  • B
    $\Delta \mathrm{H}$ is positive and $\Delta \mathrm{S}$ is negative
  • Correct answer
    C
    $\Delta \mathrm{H}$ is negative and $\Delta \mathrm{S}$ is positive
  • D
    Both $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ are negative

Solution

For spontancity $\Delta G$ must be negative $\because \Delta \mathrm{G}=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{S}$ To be negative at all Temperature, $\Delta \mathrm{H} < 0, \Delta \mathrm{S}>0$

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

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