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NEET 2013 Chemistry question

ChemistryElectrochemistryNEET 2013

A button cell used in watches functions as following If half cell potentials are ; V ; V The cell potential will be -

Answer: (1)

Solution

In the cell reaction zinc is oxidised (anode) and is reduced (cathode). Missing superscript or subscript argumentE^\circ_{cell}Missing superscript or subscript argument = E^\circ_{cathode}Missing superscript or subscript argument - E^\circ_{anode}$ = E°(Ag_2O/Ag) - E°(Zn^{2+}/Zn) = 0.34 - (-0.76)

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Question ID VK-091347