Chemistry - Electrochemistry Question with Solution | TestHub

ChemistryElectrochemistryMiscellaneous/MixedEasy2 minPYQ_2020
ChemistryEasysingle choice

CalculateΔGofor the following cell reaction
Zn s + Ag 2 O s + H 2 O l Zn 2+ aq +2Ag s +2 OH aq

EAg+/Ag0=+0.80V and EZn+2/Zn0=-0.76V ,F=96500

(Given: K sp ofAgOH=2× 10 8 )

Options:

Answer:
B
Solution:

Calculation forEOH-Ag2OAg-
Reduction[2Ag++2e-2Ags,G1o=-2×F×EoAg+|Ag
Ionisation[Ag2O+H2Ol2Ag++2OH-G2o=-2.303RTlogksp2
NetAg2O+H2Ol+2e-2Ags+2OH-,G3o=-2×F×EOH-Ag2OAgo
G3o=G1o+G2o
+2×F×EOH-Ag2OAgo=+2×F×EoAg+|Ag+2.303RTlogksp22F
EOH-Ag2OAgo=EoAg+|Ag+0.062×2logksp
=0.8+0.06log2×10-8
=0.8+0.06-8+0.3
=0.8+0.06×-7.7
=0.8-0.462
=0.338Volt0.34VGo=-nFEceuo
=-nFEco-EARed
=-2×EOH-Ag2OAgo-EZn+2|Zno
=-2×96500×0.34+0.76
=-2×96500×1.1volt
=212300J
=212.3 kJ

Stream:NTA_ABHYASSubject:ChemistryTopic:ElectrochemistrySubtopic:Miscellaneous/Mixed
2mℹ️ Source: PYQ_2020

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