Related InterviewSolutions

• An important ore of zinc metal is:A. CalamineB. CryoliteC. GibsiteD. Malachite
• An important oxide ore if iron isA. HaematiteB. SideriteC. PyritesD. Malachite
• Which of the following faction is of no significance for roasting sulphide ores to the oxide and not subjecting the sulphide ores in carbon reduction directly ?A. `CO_(2)` is thermodynamically more stable than `CS_(2)`B. Metal sulphides are less stable than the corresponding oxidesC. `CO_(2)` is more volatile than `CS_(2)`D. Metal sulphides are thermodynamically more stable than `CS_(2)`
• Commercially important ore of Lead isA. SideriteB. HaematiteC. GalenaD. None of these
• Which of the following srtatement above the advantage of masting of sulphide are before reduction is not true?A. Carbon and hydrongen are suitable reducing agents for metal sulphidesB. The `Delta""_(r)G^(0)` of the sulphide is greater than those for `CS_(2) and H_(2)S`C. The `Delta""_(r)G^(0)` is negative for roasting for sulphide ore to oxideD. Reasting of the sulphide to the oxide is thermodynamially feasible
• The reduction of zinc oxide with coke occurs at temperatureA. Greater than that for CuOB. Less than that for CuOC. Less than that for `Ag_(2)O`D. Equal to that for CuO
• In blast furnace, iron oxide is reduced byA. SilicaB. COC. CarbonD. Lime stone
• The important advantage(s) of Lintz and Donawitz (L.D.) process for the manufacture of steel is (are)A. The process is very quickB. Operation costs are lowC. Better quality steel is obtainedD. Scrap iron can be used
• The metallurgical process in which a metal is obtained in a fused state is calledA. SmeltingB. RoastingC. CalcinationD. Forth floatation
• In the metallurgical extraction of zince from `ZnO` the reducting agent used isA. Carbon monoxideB. Sulphure dioxideC. Carbon dioxideD. Nitric oxide