JEE Class main Answered
Which of the following will form a cell with highest voltage?
(E0Co2+/Co=−0.28V;E0Ag+/Ag=0.80V)
A.
1M Ag+ , 1M Co2+
B.
2M Ag+ , 2M Co2+
C.
0.1M Ag+ , 2M Co2+
D.
2MA Ag+ , 0.1M Co2+
Asked by s.ojaswini17 | 16 Feb, 2019, 13:02: PM
Option D is correct.
The cell reaction is
![2 Ag to the power of plus space space plus space Co space space rightwards arrow space Co to the power of 2 plus end exponent space space plus space space 2 Ag
We space know space that comma
straight E space equals space straight E subscript 0 space plus fraction numerator 0.059 over denominator 2 end fraction log fraction numerator open square brackets Ag to the power of plus close square brackets squared over denominator open square brackets Co to the power of 2 plus end exponent close square brackets end fraction](https://images.topperlearning.com/topper/tinymce/cache/3880f4d3a4fbea59bd4ff33e1437eb19.png)
From the equation,
Smaller the concentration of [Co2+] and larger the concentration of [Ag+] will produce maximum e.m.f.
So the correct option is D, 2 M Ag+ and 0.1 M Co2+.
Answered by Varsha | 18 Feb, 2019, 11:41: AM
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