Consider the substance:carbon dioxide, gold, bronze, alcohol, iron, and, oxygen. from the list , select the substances that :(1) support burning (2)is used to make statues (3) is an air pollutant (4) can decolorize plant pigment.

Oxygen

Explanation:

 · Air decolorization makes use of chromophores’ instability on oxygen to decolorize the oil by air-oxidizing pigments. For example, the carotenoid and chlorophyll in the oil are very unstable because of their structure, which is easy to be discolored under the action of oxygen. However, air decolorization leads to thermal oxidation of the oil, too.

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