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Redox Reactions, Oxidizing Agent, Reducing Agent

APCHEM-FXL10J

In the following reaction, which of the following species is the reducing agent?

$$3 Cu + 6 H^+ + 2 HNO_3 \longrightarrow Cu^{2+} + 2 NO + 4 H_2O$$

A

$H^{+}$

B

$Cu$

C

$NO$

D

$Cu^{+2}$