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NEET levelSingle correct optionDifficulty 1 of 3td175

For a system at equilibrium at constant temperature and pressure, which statement is correct?

A $Δ G > 0$
B $Δ G < 0$
C $Δ G^{\circ} = 0$ for every reaction
D $Δ G = 0$

Answer: D

At equilibrium the Gibbs energy of the system is at its minimum, so no net change can lower it and

Δ G = 0

.

Δ G^{\circ}

equals

- RT ln K

, which is zero only when

K = 1

.

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