Chemistry - Electrochemistry Question with Solution | TestHub

ChemistryElectrochemistryGalvanic cells/Nernst Equation/Concentration CellsEasy2 minPYQ_2020
ChemistryEasysingle choice

On the basis of information available for the reaction.
4 3 Al +  O 2 → 2 3 Al 2 O 3 ;  ΔG = –827 kJ/mol of  O 2
The minimum emf required to carry out an electrolysis ofAl2O3is:
Given: One Faraday = 96500 C

Options:

Answer:
A
Solution:

Al→Al3++3e–
4 3 mol Al≡ 4 3  × 3 mol  e −
≡4 mol  e –
n=4
ΔG=–nFE
–827×1000=–4×96500×E
E=2.14 V

Stream:NTA_ABHYAS_NEETSubject:ChemistryTopic:ElectrochemistrySubtopic:Galvanic cells/Nernst Equation/Concentration Cells
⏱ 2mℹ️ Source: PYQ_2020

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