I am not sure about this question I tried a) but am very confused with b.
Experiments were preformed with four metals and solutions of their ions: A-
A+, B-B2+, C-C2+, D-D2+. The results of the experiment were:
D2+ + C --> No reaction
B2+ + C --> B + C2+
A+ + B --> A + B2+
a)Write the equation for each reduction half reaction.
D2+ + 2e- --> D
C2+ + 2e- --> C
B2+ + 2e- --> B
A+ + 1e- --> A
b)Arrange them in a relative potential table with the easiest to reduce at the top and the hardest to reduce at the bottom.
A+ + 1e- --> A
???