KVPY SX SB Exam 2015 Question Paper

Question : 104 of 120

Marks: +1, -0

The standard cell potential for

Zn|Zn^{2+} ||Cu^{2+}|Cu

is 1.10 V. When the cell is completely discharged, log

[Zn^{2+}]/[Cu^{2+}]

is closest to

Solution:

0 = 1.1-0.0591/2\log { Zn^{2+}} /{Cu^{2+}}

-1.1=0.0591/2\log { Zn^{2+}} /{Cu^{2+}}

\log { Zn^{2+}} /{Cu^{2+}} =37.3

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