1. Non metals are[IOM 2066]
- Malleable
- Solid
- Ductile
- Brittle
(d) Non-metals are typically brittle (break easily when hammered) 2. Substance that reacts with infusible impurities present in an ore to form fusible mass is called[MOE 2066, I.E. 2004]
(d) Flux combines with gangue to form slag (fusible mass) 3. Malachite is an ore of[MOE 2066, IOM, KU]
(b) Malachite: Cu2(CO3)(OH)2 - copper carbonate hydroxide - Non metal
- Metal
- Metalloid
- None
(c) Arsenic shows properties intermediate between metals and non-metals 5. Dolomite is the ...... form of magnesium[IOM 1999]
- Carbonate
- Sulphate
- Oxide
- Chloride
(a) Dolomite: CaMg(CO3)2 (double carbonate) 6. Acidic flux is[IOM 1997]
(c) SiO2 (silica) is an acidic flux used to remove basic impurities 7. The process of converting hydrated alumina to anhydrous alumina is known as[IOM 1996]
- Roasting
- Smelting
- Calcination
- Cupellation
(c) Calcination removes water of crystallization (Al2O3.xH2O → Al2O3) 8. The chief ore of tin is[BPKIHS]
- Cerrusite
- Cassiterite
- Anglesite
- Cinnabar
(b) Cassiterite: SnO2 (tin oxide) 9. Electrolytic reduction method is used in the extraction of[BPKIHS 2005]
- Highly electropositive element
- Highly electronegative element
- Inert metals
- Transitional metals
(a) Highly electropositive metals (Na, K, Ca, Al) are extracted by electrolysis 10. Froth floatation process for purification of sulphide ore is based on[BPKIHS 2006]
- Absorption
- Adsorption
- Reduction
- Oxidation
(b) Based on selective adsorption of oil on sulphide ore particles 11. Froth floatation process is used for the metallurgy of[KU, IOM, MOE]
- Oxide ore
- Sulphide ore
- Chloride ore
- Amalgam
(b) Specifically for sulphide ores (e.g., ZnS, PbS, CuFeS2) 12. An essential metal in amalgam is[MOE]
- Any alkali metal
- Gold
- Mercury
- Copper
(c) Amalgam = alloy containing mercury 13. The slag obtained during the extraction of copper pyrites is composed mainly of[MOE 2066]
(b) FeO (from ore) + SiO2 (flux) → FeSiO3 (slag) 14. The agent used to remove impurities from the ore is[KU 2006]
(b) Flux reacts with gangue to form slag 15. Acidic flux is used for removal of[MOE 2008]
- Basic flux
- Basic gangue
- Acidic gangue
- Slag
(b) Acid flux (SiO2) removes basic impurities (CaO, MgO) 16. The heating of pyrites to remove sulphur is known as
- Bessemerisation
- Calcination
- Roasting
- Smelting
(c) Roasting converts sulphides to oxides by heating in air 17. The waste material present in an ore (mineral) is called
(c) Gangue = unwanted earthy/rocky material in ore 18. In Alumino-thermic process Al is used[BPKIHS 2006, I.E.]
- As reducing agent
- As oxidizing agent
- To increase the volume
- To lower the heat of furnace
(a) Al reduces metal oxides (Cr2O3, Fe2O3) by thermite reaction 19. In the extraction of copper from its sulphide ore the metal is formed by the reduction of Cu2O with[MOE]
(c) Cu2O + Cu2S → 4Cu + SO2 (auto-reduction) 20. The metallurgical process in which metal is obtained in fused state is called
- Smelting
- Roasting
- Calcination
- Froth flotation
(a) Smelting produces liquid metal 21. In Goldschmidt aluminothermic process, reducing agent used is
(b) Al reduces metal oxides (Fe2O3, Cr2O3) in exothermic reaction 23. The ore of Lead is
- Calamine
- Cinnabar
- Galena
- Magnetite
(c) Galena: PbS (lead sulphide) 24. In blast furnace iron oxide is reduced by[MOE]
(b) Main reduction: Fe2O3 + 3CO → 2Fe + 3CO2 25. Calcination and roasting are carried in[IE]
- Blast furnace
- Muffle furnace
- Reverberatory furnace
- Open hearth furnace
(c) Reverberatory furnace used for both processes 26. Purification of aluminium by electrolytic process is known as[IOM 2004]
- Hoope's process
- Serpeck's process
- Hall's process
- Bayer's process
(a) Hoope's process: electrolytic refining of Al 27. Which of the following metal protects itself by forming its oxide on the surface[BPKIHS 2006]
(a) Al forms protective Al2O3 layer 28. The chief ore of Aluminium is[MOE, KU 2008, KU 2003]
- Fluorspar
- Bauxite
- Dolomite
- Cryolite
(b) Bauxite is primary ore (Al2O3.2H2O) 29. Bauxite is an ore of[I.E. 2003]
(b) Bauxite contains aluminium 30. A mixture of Al(OH)3 and Fe(OH)3 can be separated by[MOE]
(c) NaOH dissolves Al(OH)3 (amphoteric) but not Fe(OH)3 31. The most abundant metal on the surface of the earth is[BPKIHS]
(b) Aluminium is 8% of Earth's crust (most abundant metal) 32. Silver containing lead as an impurity is removed by[I.E.]
- Poling
- Cupellation
- Lavigation
- Distillation
(b) Cupellation: Pb oxidizes to PbO which is absorbed by bone ash 