Which substance serves as the reducing agent in the following unbalanced reaction that occurs in acid:
Cr2O72– (aq) + Ni (s) → Ni 2+ (aq) + 2 Cr 3+ (aq) (acidic solution)
a) H+ (aq)
b) Cr2O72– (aq)
c) Ni (s)
d) Ni2+ (aq)
e) H2O (l)
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