1.

(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.

Answer»

Solution :(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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