For the given reactions, classify the reactants as the reducing agent, oxidizing agent, or neither.
F2 + H2 > 2HF
2Mg + O2 > 2MgO

For , is the oxidizing agent and is the reducing agent.

For , Mg is the reducing agent and is the oxidizing agent.

Explanation:

An oxidizing agent is defined as the substance which tends to oxidize other substances by itself gaining electrons. As a result, there will occur a decrease in its oxidation state.

On the other hand, a substance which tends to reduce other substances by itself losing electrons is known as an reducing agent. There will occur an increase in oxidation state of a reducing agent.

For example,

Oxidation:

Reduction:

Hence, here is the oxidizing agent and is the reducing agent.

Also,

Oxidation:

Reduction:

Hence, here Mg is the reducing agent and is the oxidizing agent.