Question

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

Answer 1

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.

Step-by-step 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.