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| 1. |
Out ofCandCO, which is betterreducingagentfor ZnO ? |
| Answer» SOLUTION : The` DELTA _f G ^(@) ` of`CO_ 2 `from CO isalways higherthanthatof` Delta_f G ^(@)`of` ZnO `.Therefore, COcannotbe usedforreductionofZnOtoZn. In contrast,` Delta _f G ^(@) `ofCOfrom Cis lowerattemperaturesabove1180 Kwhilethatof` CO_ 2`from C islowerintemperatureabove1270Kthan`Delta_ FG ^(@) `ofZnO.Thus,above1270 K, ZnO canbereducedto Zn byC.Inactualpractice , reductionisusuallycarriedoutaround1673 K so that thereductionprocess essentilly goestocompletion.Thus,outofCandCO, C isabetter reducingagentthanCOforreductionofZnOtoZn. | |