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What is galvanic cell ? Give half cell reaction of Daniell cell and explain redox couple.

Answer»

Solution :(a) Galvanic cell: It is an electrochemical cell that converts the CHEMICAL ENERGY of a SPONTANEOUS redox reaction into electrical energy.
(b) Chemical reaction occurs in Daniell cell:
(i) `Cu_((aq))^(2+)+2e^(-)toCu_((s))` (reduction half reaction)
(ii) `Zn_((s))toZn_((aq))^(2+)+2e^(-)` (oxidation half reaction)
(iii) `Zn_((s))toCu_((aq))^(2+) to Zn_((aq))^(2+)+Cu_((s))` (redox reaction)
This reaction is the combination of two half reactions whose addition gives the overall cell raction.
These reactions occur in two different portions of the Daniell cell.
The reduction half reaction occurs on the copper electrode while the oxidation half reaction occurs on the zinc electrode.
These two portions of the cell are ALSO called half-cells or redox couples.
The copperelectrode may be called the reduction half-cell and the zinc electrode the oxidation half-cell.


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