GATE 2021 MT – Question 26
Given $E^\circ_{Ni^{2+}/Ni}=-0.25$ V and $F=96500$ C/mol, the standard chemical potential $\mu^\circ_{Ni^{2+}}$ at 298 K is ______ J/mol (nearest integer).
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Correct answer: -48251 to -48240
Explanation
For Ni²⁺+2e⁻→Ni, ΔG°=−2FE°. Taking standard elemental-metal and electron chemical potentials as the reference makes μ°Ni2+=2FE°.
Thus 2×96500×(−0.25)=**−48250 J/mol**.