KVPY SX SB Exam 2016 Question Paper

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Question : 106 of 120

Marks: +1, -0

Given the standard potentials Eº(Cu

^{2+}

/Cu) and Eº(Cu

^{+}

/Cu) as 0.340 V and 0.522 V respectively, the value of Eº(Cu

^{2+}

/Cu

^{+}

) is

0.364 V
0.158 V
– 0.182 V
– 0.316 V

Solution:

\table Cu^{+2}+2e^{-}→Cu,\ΔG°=-n_1E_1°F;Cu^{+2}+e^{-}→Cu,\ΔG_2°=-n_2E_2°F;----------,----------;Cu^{+2}+e^{-}→Cu^{+},\ΔG°_3=-n_3E_3°F

\ΔG°_3=\ΔG°_1-\ΔG°_2

-n_2E_3°F=-n_1E_1°F+n_2E_2°F

E_3°={n_1E_1°-n_2E_2°}/n_3

={2×0.34-0.522}/1

= 0.158V

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