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If the E° cell for a given reaction has a negative value, then which of the following gives the correct relationships for the values of ΔG° and K° eq?

1. ΔG° > 0 ; K° eq > 1
2. ΔG° < 0 ; K° eq > 1
3. ΔG° > 0 ; K° eq < 1
4. ΔG° < 0 ; K° eq < 1

Correct answer: ΔG° > 0 ; K° eq < 1

Solution

A negative E° cell implies that the reaction is non-spontaneous, so ΔG° > 0 and K° eq < 1, as ΔG° and K° eq are related to E° cell through thermodynamic equations.

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