Question

For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

Answer 1

Answer:

Hi, the given question has some missing part. Complete question is: " For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

A. ΔS° > 0, ΔH° > 0

B. ΔS° > 0, ΔH° < 0

C. ΔS° < 0, ΔH° < 0

D. ΔS° < 0, ΔH° > 0

E. All reactions are spontaneous at some temperature."

Option (D) is correct.

Explanation:

We know that, $\Delta G^{0}=\Delta H^{0}-T\Delta S^{0}$

Where T represents temperature in kelvin scale. Hence it is always positive.

For a non-spontaneous reaction, $\Delta G^{0}$ should be positive.

If $\Delta S^{0}< 0$ then $-T\Delta S^{0}> 0$ at any T value.

Hence $\Delta G^{0}> 0$ for any value of T if both $\Delta H^{0}$ and $-T\Delta S^{0}$ are greater than zero.

So, option (D) is correct.