When the powder of a common metal is heated in an open China dish it's colour turns black. However, when hydrogen is passed over the hot black Substance is formed, it regains it's original colour. Based on. (I) what type of chemical reaction takes place in each of the two given steps?
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Answer:
oxidation reaction and reduction reaction
Explanation:
CuO when heated gains O2 turns in black color and when hydrogen is passed it will lose O2 and thus will have its original color
Remeber , hydrogen is one of the reducing agent
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