AIPMT PRELIMS 2010 Chemistry Gibbs Free Energy MCQ Question
For the reduction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25°C. The value of standard Gibbs energy, ΔG⁰ will be (F = 96500 C mol⁻¹)
−98.0 kJ
−89.0 kJ
−79.0 kJ
−44.5 kJ
Correct Answer
Detailed Explanation
The standard Gibbs energy change can be calculated using the formula ΔG⁰ = −nFE⁰. Here, n = 2 (number of electrons transferred), F = 96500 C mol⁻¹, and E⁰ = 0.46 V. Substituting these values gives ΔG⁰ = −(2)(96500)(0.46) = −89.0 kJ.
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