Which of the following changes is chemical?

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A Evaporation of water
B Folding of paper
C Rusting of a nail
D Ripping a t-shirt

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Answer: C. Rusting of a nail

Nails are made of iron. When iron gets rusted, it's chemical composition changes. Hence this is a chemical change. All the other options are physical changes in which after a process, the chemical composition remains the same.

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Which of the following changes is chemical?

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