Related InterviewSolutions

• Which of the following is better reducing agent at 673K in pyrometallurgy?A. CB. `CO_(2)`C. COD. None of these
• By which process Pba and Sn are extracted respectively are:A. Carbon reduction and self reductionB. self reduction and Carbon reductionC. electrolytic reduction and cynanide processD. cynanide process and electrolytic reduction
• In which of the following isolations no reducing agent is requiredgtA. Iron from haematiteB. Tin from cassiteriteC. Mercury from cinnabarD. Zinc from zinc blende
• In which of the following extraction no reducing agent is required?A. Iron from haematitreB. Aluminium from bauxiteC. Magnesium from carnalliteD. Zinc from zinc blende
• Statement-1: Carbon cannot be used as a reducing agent for the extraction of second group metals. Statement-2: Second group metals are extracted from their fused salts by electrolytic reduction:A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True.
• Railway wagon axles are made by heating rods of iron embedded in charcoal powerder. The process is known asA. sherardisingB. annelalingC. temperingD. case hardening
• Galvanisation is applying a coating ofA. ZnB. PbC. CrD. Cu
• Roasting of copper pyrites is done:A. to remove moistureB. to oxidise free sulphur and antimonyC. to convert pyrite completely into `Cu_(2)O and FeO`D. to remove volatle organic impurities
• Which of the following options are observed during roasting?A. Convert sulphide to oxide and sulphateB. Remove water of hydrationC. Melt the oreD. Remove arsenic and sulphur impurities
• Roasting can be performed in:A. blast furnaceB. reveberatory furnaceC. electric furnaceD. None of these