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a. Write the balanced chemical equations...

a. Write the balanced chemical equations for the extraction of copper metal from its ore. What is the reducing agent used?
b. What is the chemical formed as green coating when copper reacts with atmospheric gases in moist conditions?

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a. The ore of copper used for its extraction is `Cu_(2)S`, since it is a sulphide ore the process of extraction involves roasting method and during this process the ore itself acts as a reducing agent.
`2Cu_(2)S+3O_(3)to2Cu_(2)O+2SO_(2)`
`2Cu_(2))+Cu_(2)Sto6Cu+SO_(2)`
b. Basic copper cabonate `CuCO_(3).Cu(OH)_(2)` and basic copper sulphate `CuSO_(4).3Cu(OH)_(2)`.
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