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Q.

The oxidation potentials of Zn,Cu, Ag, H2 and Ni are 0.76, -0.34, -0.80, 0.00, 0.25 volt, respectively. Which of the following reactions will provide maximum voltage?

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a

Zn+Cu2+→Cu+Zn2+

b

Zn+2Ag+→2Ag+Zn2+

c

H2+Cu2+→2H++Cu

d

H2+Ni2+→2H++Ni

answer is B.

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Detailed Solution

Ecello=0.8−(−0.76)=1.56 VMaximum voltage is produced when electrode having minimum oxidation potential is made cathode and maximum oxidation potential is made anode.
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