Which of the following is the strongest reducing agent? (The standard reduction potential of each species is provided in parentheses.)
A) FADH2 (+0.22V)
B) H2 (+0.424V)
C) Cytochrome a-Fe+2 (-0.29V)
D) Lactate ( + 0.19 V)
E) H2O (+0.82V)
Answer: B) H2 (+0.424V)