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Question 6 Consider the following standard reduction potentials. Reduction Half-Reaction A13+ (aq) + 3e-Al(s) Fe2+(aq) + 2e-F
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Answer #1

Al can be paired with other two to form cells , as the emf of such cells are positive, which means spontaneous reaction.
1) Al/Fe cell
The cell reaction is
2Al + 3Fe+2 -----> 2 Al+3 + 3 Fe
For this cell
the emf = E0 of fe - E0 of Al= -0.44-(-1.66) = +1.22V
thus the cell is feasible.
2) Al/Sn cell
2Al + 3Sn+2 -----> 2 Al+3 + 3 Sn
For this cell
the emf = E0 of Sn - E0 of Al= -0.14-(-1.66) = +1.52V
thus the cell is feasible.

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