Answer
Please see the work below.
Work Step by Step
We know that
a. Al changes from oxidation number zero to +3, hence it is a reducing agent.
b. Hg changes form oxidation state +2 to 0, hence $Hg^{+2}$ is the oxidizing agent.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 4 - Chemical Reactions - Questions and Problems - Page 172: 4.63
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