a) Use these observations and arrange the following five reduction half-cell reactions in order, the one with the largest positive reduction potential listed first.
A(2+) + 2e- -> A(s)
B(+) + e- -> B(s)
C(2+) + 2e- -> C(s)
D(2+) + 2e- -> D(s)
2H(+) + 2e- -> H2(g)
b) Which metal is the best...