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Question

# The standard reducation potentials ofZn2+|Zn,Cu2+|Cu and Ag+|Agare respectively -0.76, 0.34 and 0.8 V. The following cells were constructed.a) Zn|Zn2+||Cu2+|Cub) Zn|Zn2+||Ag+|Agc) Cu|Cu2+||Ag+|Ag What is the correct order E0cell of these cells?

A
b>c>a
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B
b>a>c
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C
a>b>c
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D
c>a>b
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Solution

## The correct option is B b>a>ca)Zn|Zn2+||Cu2+|Cu, E∘cell=−(−0.76)+0.34 =1.10b)Zn|Zn2+||Ag+|Ag, E∘cell=−(0.76)+0.8 =1.56c)Cu|Cu2+||Ag+|Ag, E∘cell=−0.34+0.8 =0.46∴ Cell potentials are in the order:b >a >cHence, option B is correct.

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