alleryThe relation between cell EMF and Gibbs free-energy change is:
AΔG = +nFE_cell
BΔG = nF/E_cell
CΔG = −nFE_cell
DΔG = E_cell/nF
Answer & Solution
Correct answer: C. ΔG = −nFE_cell
**ΔG = −nFE_cell**.
A positive E_cell (spontaneous galvanic) corresponds to negative ΔG (spontaneous reaction).
Watch the sign — this also explains why doubling the cell reaction doubles ΔG but does NOT change E_cell (intensive).
Keep practising Unit 9B1: Electrochemical Cells and Standard Potentials
Browse all Unit 9B1: Electrochemical Cells and Standard Potentials questions for NEET UG, or explore more Chemistry topics.
Related questions
The de-Broglie wavelength associated with a particle of mass $10^{-6}$ kg with a velocity Rust is chemically:Rusting of iron is an electrochemical phenomenon. At the cathodic spot, the reaction is:In the H₂–O₂ fuel cell used in the Apollo space programme, the electrolyte is:The electrolyte in a lead storage battery (lead-acid) is approximately:During electrolysis of **aqueous** NaCl (brine), the products are:In the electrolysis of **molten** NaCl, the products at the cathode and anode respectivelyA CuSO₄ solution is electrolysed with 1.5 A for 10 minutes. The mass of copper (M = 63.5)