Answer:
d. The change is not a physical change because a new chemical is formed on the outside of the statue.
This change is not a physical change as a new chemical has formed resulting in colour change. So the correct option is D.
The corrosion of copper occurs due to the oxidation of copper when it is exposed to air. Oxidation of copper results in the formation of a blue-green coloured deposit on the surface of copper corrosion can also occur due to contact with an acidic substance, water or salt water etc.
Unlike the rust of iron, the oxidized carbon strongly sticks to the surface of copper. Therefore oxidation of the top layer of copper protects it from further oxidation.
This is seen as a positive effect in the case of copper roofs or sculptures, for example, The Statue of Liberty. But, this can be poisonous in the case of copper utensils.
Copper utensils can get corroded when food with acidic components like vinegar is cooked in copperware. Consumption of food prepared in corroded copper vessels can be harmful to the body.
Therefore corrosion of copper is a chemical change and the correct option is D.
Read more about copper oxidation, here
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