give one example of each: change in substance's colour during a chemical reaction
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Copper reacts with oxygen, H2O and CO2 to give copper carbonate, which changes color from brown to blue or blue green. Rusting, blackening of surfaces of cut vegetables and fruits are other examples of change of color in a chemical reaction.
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K2MnO4
KMnO4
CuSO4.6H20
AgNO3 ect
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