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Question: 1 / 400

A reduction reaction involves what?

The addition of oxygen

The removal of hydrogen

The addition of hydrogen or the removal of oxygen

A reduction reaction involves either the addition of hydrogen or the removal of oxygen. This is because in a reduction reaction, an atom or molecule gains electrons, which leads to a decrease in its oxidation state. In contrast, the incorrect options A, B, and D involve processes that would result in an increase in oxidation state, which is opposite of what occurs in a reduction reaction. Therefore, A, B, and D are not correct choices for what a reduction reaction involves.

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The removal of nitrogen

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