Chemistry
A brown substance A on heating in air turns black forming another substance B. Substances A and B are:
- A = Fe and B = FeO
- A = Zn and B = ZnO
- A = Cu and B = CuO
- A = Pb and B = PbO
Chemical Reaction
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Answer
A = Cu and B = CuO
Reason — Brown copper on heating forms black copper oxide.
2Cu + O2 ⟶ 2CuO
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