Multiple choice

In which of the following conditions, a process carried out at constant temperature and pressure will be spontaneous for all temperatures?

  1. ΔS positive, ΔH negative
  2. ΔS positive, ΔH positive
  3. ΔS negative, ΔH negative
  4. ΔS negative, ΔH positive

  1. Only 1

  2. 1 and 2

  3. 2 and 3

  4. 3 and 4

  5. Only 4
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A Correct answer
Explanation

A process carried out at constant temperature and pressure will be spontaneous only if ΔG is negative. ΔG = ΔH - T ΔS If ΔS is positive and ΔH is negative, then ΔG will be negative at all temperatures. Hence, the process will be spontaneous at all temperatures.

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