1. Explain the following :
(a) CO2 is a better reducing agent below 710 K whereas CO is a better reducing agent above 710 K.
(b) Generally, sulfide ores are converted into oxides before reduction.
(c) Silica is added to the sulfide ore of copper in the reverberatory furnace.
(d) Carbon and hydrogen are not used as reducing agents at high temperatures.
(e) Vapor phase refining method is used for the purification of Ti.
1. Explain the following :
(a) CO2 is a better reducing agent below 710 K whereas CO is a better reducing agent above 710 K.
(b) Generally, sulfide ores are converted into oxides before reduction.
(c) Silica is added to the sulfide ore of copper in the reverberatory furnace.
(d) Carbon and hydrogen are not used as reducing agents at high temperatures.
(e) Vapor phase refining method is used for the purification of Ti.
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1 Answer
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1. Ans:
(a). According to Ellingham diagram, the reaction of CO2 is more feasible at temperatures lower than 710 K and thus it is a better reducing agent below 710 K.
While the reaction of CO is more feasible at temperatures higher than 710 K and thus it is a better reducing agent at above 710 K.
(b). According to the Ellingham diagram, the more negative the Gibbs free energy of a particular reaction the more feasible it is to carry out. Since the oxides are easier to reduce, sulfide ores are converted into oxides before reduction.
(c). To extract copper,
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