Introductory Chemistry (5th Edition)

Published by Pearson
ISBN 10: 032191029X
ISBN 13: 978-0-32191-029-5

Chapter 16 - Oxidation and Reduction - Exercises - Problems - Page 605: 75

Answer

$Al$ is the strongest reducing agent.

Work Step by Step

From the list of metals $(Mn,Al,Ni,and Cr)$ the metal which is the best reducing agent which means it is most easily oxidized or loses its electrons is Al according to the activity series because it's higher up than the other metals listed.
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