Chemical weathering typically affects materials that are more reactive to environmental conditions, such as water, acids, and other chemical agents.
Among the options you provided:
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Marble: This is mainly composed of calcite, which can react with acids and is susceptible to chemical weathering.
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Plastic: Generally, plastics are resistant to chemical weathering, though they might degrade due to UV exposure or physical processes over time.
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Iron rods: Iron can rust and corrode when exposed to water and oxygen, which is a form of chemical weathering.
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Feldspar: This mineral can undergo chemical weathering, particularly through hydrolysis, altering into clay minerals.
Given this information, the chair made of plastic is the least affected by chemical weathering compared to the other materials listed.