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(a) What are fuel cells? Explain the ele...

(a) What are fuel cells? Explain the electrode reactions involved in the working of `H_2-O_2` fuel cell.
(b) Represent the galvanic cell in which the reaction
`Zn(s)+Cu^(2+) (aq) to Zn^(2+) (aq) +Cu(s)` takes place.

Text Solution

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(a) The cells which convert chemical energy of a fuel directly into electrical energy is known as fuel cells. The electrode reactions are:
Anode:
`[H_2(g)+2OH^(-) (aq)to2H_2O(l)+2e^(-) J times 2`
Cathode:
`O_2(g)+2H_2O(l)+4e^(- ) to 4OH^(- ) (aq)`
NEt reaction:
`2H_2(g)+O_2(g) to 2H_2O (l)`
(b)
May be represented as `Zn(s)|Zn^(2+) (aq) ||Cu^(2+)(aq)|Cu(s)`
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