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  4. Among the following metals, the strongest reducing agent is

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Q. Among the following metals, the strongest reducing agent is

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Solution:

The order of reducing agent can be determined with the help of electrochemical series. It is a series of electrodes or half-cells arranged in order of their decreasing standard reduction potential.
As the reduction potential decreases the strength of reducing agent also decreases. According to this series, the order of increasing reducing agent,
$Fe< Cu< Ni< Zn.$
Thus, among the given metals, $Zn$ is the strongest reducing agent.