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Question:

What of the following compounds is reduced in the following chemical reaction?
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A $3206_w34_h15.png$
Explaination

This is the equation for photosynthesis. In photosynthesis, the carbon dioxide is reduced (gains electrons) to become glucose. The oxidation number of carbon in carbon dioxide is +4, however the oxidation number of carbon in glucose is 0, therefore the carbon gains 4 electrons to reduce its oxidation number.[Earth and Physical Science]