We're being asked to determine which metal/s are/is capable of reducing Mn3+ to Mn2+ but not Cr3+ to Cr2+ given their standard reduction potential
In this case, we have to get the resulting Ecell of each redox reaction pairing Mn3+/Mn2+ as well as Cr3+/Cr2+ to each oxidation of metal
Recall that the greater the E°cell of a redox reaction, the more likely the reaction will occur (more spontaneous reaction)
Using the standard reduction potentials,
Pb 2+(aq) + 2e– => Pb(s), E° = –0.13 V
Fe 2+(aq) + 2e– => Fe(s), E° = –0.44 V
Zn 2+(aq) + 2e– => Zn(s), E° = –0.76 V
which metal will reduce Mn 3+ to Mn 2+ (E° red = +1.51 V) but will not reduce Cr 3+ to Cr 2+ (E° red = -0.40 V)
a. Pb only
b. Fe only
c. Zn only
d. Fe and Zn
e. Fe and Pb
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