Consider the figure below and answer the following questions :
(i) Cell 'A' has `E_(cell)=2" V "` and Cell B has `E_(cell) =1.1" V "` which of the two cells 'A' or 'B' will act as an electrolytic cell. Which electrode reactions will occur in this cell ?
(ii) If cell 'A' has `E_(cell)=0.5" V "` and cell 'B' has `E_(cell) =1.1" V "` then what will be the reactions at anode and cathode ?

Explanation

(i) Since the cell (B) has low e.m.f. , it will act as electrolytic cell. In the cell, the electrode reaction that takes place is :
`Zn^(2+)(aq)+2e^(-) to Zn(s)" "("At cathode")`
`Cuoverset((aq)) rarr Cu^(2+)(aq)+2e^(-)`
(ii) The data shows that the cell 'B' will act as electrochemical cell since its `E_(cell)`. (1.1V) is mre than that of cell 'A' (0.5V).The electrode reactions which take place are :
`Zn(s) to Zn^(2+)(aq)+2e^(-)" " ("At anode")`
`Cu^(2+)(aq)+2e^(-) to Cu(s)" " ("At cathode")`