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When the free energy occurs at standard conditions, it is termed as ______________

(a) Activation energy

(b) pKa

(c) Standard free energy change

(d) Gibbs free energy

I had been asked this question in examination.

My question is based upon Enzyme Kinetics topic in division Enzyme Kinetics of Enzyme Technology

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Best answer
The correct choice is (c) Standard free energy change

Best explanation: Standard free energy change is referred to as the free energy change occurring at standard conditions, i.e., at 25°C, pH 7, 1 mol/L solute concentration and normal gas. Gibbs free energy is the energy that exist for performing work. Activation energy is the energy required to attain transition state. pKa is the pH at which half of the ions are ionized.

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