Metallurgy Metallurgy English 1 / 30Sulphide ores are generally concentrated by- Froth floatation method Roasting Gravity Reduction by Carbon 2 / 30The formula of copper pyrite is- Cu₂S CuFeS CuFeS₂ Cu₂FeS₂ 3 / 30Element found in sea water is- Magnesium sodium Iodine None of these 4 / 30The important ore of Aluminium (Al) is- Bauxite Cryollite Feldspar Malachite 5 / 30Dolomite contains- Al Mg K Ca 6 / 30Smelting involves reduction of metal oxide with. Al C Mg CO 7 / 30The impurities  present in the ore is called. Flux gangue Slag alloy 8 / 30Cassiterite is an ore of- Mn Ni Sb Sn 9 / 30Which one of the following elements is found in free state in nature ? Sodium Iron Zinc Gold 10 / 30The ore of aluminium is- bauxite haematite dolomite None of these 11 / 30Cinnabar is- HgS PbS SnO2 PbCO3 12 / 30In which of the following Ca and Mg both are present ? Lime stone chalk ice-land spar Dolomite 13 / 30Which among the following is the purest form of commercial iron ? cast iron wroght iron steel pig iron 14 / 30Which among the following metal is not extracted by electrolytic methed ? Na Mg AL Fe 15 / 30Blister copper is- Impure copper Cu alloy pure copper Copper having 1% impurity 16 / 30Which among the following is extracted by carbon reduction process? Cu Al Fe Mg 17 / 30Which among the following ore is concentrated by froath-floatation process? Cinabar Bauxite Malachite Zincite 18 / 30Which among  the following is concentrated by gravity separation method? Calamine Haematite Chalcopyrite Bauxite 19 / 30Which element is present in excess as impurity in pig iron ? Phosphorus Manganese Carbon Silicon 20 / 30Mineral of iron is- Malachite Haematite Copperglance Zinc blende 21 / 30Galena is an ore of- Ag Pb Cu Fe 22 / 30The formula of copper pyrite is- Cu₂S CuFeS CuFeS₂ Cu₂FeS₂ 23 / 30The most abundant element in the earth's crust (by weight) is: Si Al O Fe 24 / 30Heating of pyrites to remove sulphur is called: Smelting Calcination Liquation Roasting 25 / 30In the extraction of iron, the slag produced is: CO FeSiO3 MgSiO3 CaSiO3 26 / 30German silver is an alloy of- Cu and Zn Cu and Ag Cu and Sn Cu, Zn and Ni 27 / 30Bronze is an alloy of – Cu + Sn Cu + Zn Cu+Al Cu + Ni 28 / 30Most abundant metal on the surface of earth is Iron Aluminium Calcium Sodium 29 / 30The impurities associated with mineral used in metallurgy are called? Slag Flux Gangue Ore 30 / 30A process employed for the concentration of sulphide ore is: Froth floatation Roasting Electrolysis Bessemerisation Your score isThe average score is 79% 0% Restart quiz