Topical Questions
These questions are keyed to major topics in the chapter. Usually a question that is answered at the back of this book is paired with a similar one that is not.
From which of the metal oxides in Question 92 could the metal be obtained by coupling reduction of the oxide with oxidation of coke to carbon monoxide at 1500 °C?
Question 92
To obtain a metal from its ore, the decomposition of the metal oxide to form the metal and oxygen is often coupled with oxidation of coke (carbon) to carbon monoxide. For each metal oxide listed, write a balanced equation for the decomposition of the oxide and for the overall reaction when the decomposition is coupled to oxidation of coke to carbon monoxide. Calculate the overall value of ΔG° for each coupled reaction at 25 °C. Which of the metals could be obtained from these ores at 25 °C by this method?
(a) CuO(s)
(b) Ag2O(s)
(c) HgO(s)
(d) MgO(s)
(e) PbO(s)
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