The two correct examples of chemical weathering are:
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Acid rain breaking down compounds in rock statues - This is a clear example of chemical weathering as the acid in the rain reacts with the minerals in the rock, causing them to break down.
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Oxidation of certain metals in rock - This process involves a chemical reaction (oxidation) that alters the minerals within the rock, also classifying it as chemical weathering.
The other options are related to physical weathering or biological processes rather than chemical weathering.