brown coloured copper powder on heating in air turns into black coloured substance.
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Yaa it's happened because of a chemical reaction taking place between copper and oxygen to form copper oxide
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it occurs due to oxidation of copper
2Cu + O₂ ==> 2CuO
brown black
Thus copper oxide is formed which is BLACK in colour
Hope it helps you
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2Cu + O₂ ==> 2CuO
brown black
Thus copper oxide is formed which is BLACK in colour
Hope it helps you
Please mark as BRAINLIST if it helps you
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