Question 1
Under standard-state conditions, which of the following half-reactions occurs at the cathode during the electrolysis of aqueous nickel sulfate at 25°C?
◦ 2H
2O → O
2 + 4H
+ + 4e
–◦ Ni
2+ + 2e
–→ Ni
◦ 2H
2O + 2e
–→ H
2 + 2OH
–◦ Ni → Ni
2+ + 2e
–Question 2
Using a table of standard electrode potentials, decide which of the following statements is completely true.
◦ Cu
2+ can oxidize H
2, and Fe can reduce Mn
2+.
◦ Ni
2+ can oxidize Cu
2+, and Fe
2+ can reduce H
+.
◦ Fe
2+ can oxidize H
2, and Fe
2+ can reduce Au
3+.
◦ Br
2 can oxidize Ni, and H
2 can reduce Mn
2+.
◦ H
+ can oxidize Fe, and Ni can reduce Br
2.