Answer: as copper has lower electrode potential value than hydrogen, it could be reduced by hydrogen.
Explanation: hydrogen has zero reduction potential while Cu has +0.34V and Al has -1.66 V .
SO in electrochemical series who has most negative or less reduction potential value tends to be a good reducing agent than the other.
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Answer:
it's when a rock or some type of building material starts to wither because of a chemical reaction
Hg + O2 --> HgO + O
Note that Mercury has a variable valency.
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