Redox Reactions And Electrochemistry Ques 143

Question: $ EMF $ of cell $ Ni|N{i^{2+}},(1.0,M)||A{u^{3+}},(1.0,M)|Au $ (Where $ E^{o} $ for $ N{i^{2+}}|Ni $ is $ -0.25V;E^{o} $ for $ A{u^{+3,}},|Au $ is $ 1.50V) $ is [MP PET 1993; MP PMT 2000]

Options:

A) + 1.25 V

B) $ -,1.75V $

C) + 1.75 V

D) + 4.0 V

Show Answer

Answer:

Correct Answer: C

Solution:

$ {E_{cell}}=E_{A{u^{3+}}/Au}^{o}-E_{N{i^{2+}}/Ni}^{o} $ $ =1.50-(-0.25)=1.75 $ V.



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