Description : Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matt
Last Answer : Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and ... D. `Cu_(2)O +FeO`(large amount).
Last Answer : Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then ... CaSiO_(3)` D. `Cu_(2)O.SiO_(2)`
Last Answer : Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and ... (3)` D. To check the reduction of FeO
Last Answer : Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then ... O` D. `CuCO_(3).Cu(OH)_(2)`
Description : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air in a reverberatory furnace to obtain th
Last Answer : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air ... III and IV D. I , II , III and IV
Description : When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matter contains__________
Last Answer : When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper ... sulphides of copper (I) and iron (III)
Description : Roasting is carried out to :
Last Answer : Roasting is carried out to : A. convert sulphide to oxide and sulphate B. remove water of ... melt the ore D. remove arsenic and sulphur impurities
Description : Roasting is carried out in case of:
Last Answer : Roasting is carried out in case of: A. Iron pyrites B. Galena C. Copper glance D. All
Description : (A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ore is done by calcinaiton
Last Answer : (A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ... . If (A) is incorrect but (R ) is correct
Description : Which of the following metals can be oriented directly during the roasting of its sulphide ore
Last Answer : Which of the following metals can be oriented directly during the roasting of its sulphide ore A. Hg B. Zn C. Fe D. Ca
Description : The use of heat treatment of ore that includes smelting and roasting is termed as - (1) Electrometallurgy (2) Hydrometallurgy (3) Pyrometallurgy (4) Cryometallurgy
Last Answer : (3) Pyrometallurgy Explanation: Pyrometallurgy consists of the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformations in the materials to enable ... in a blast furnace in order to fuse the desired metals into impure molten bullion.
Description : Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting
Last Answer : (2) Calcination Explanation: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of ... as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
Description : The use of Heat treatment of ore that includes smelting and roasting is termed as–
Last Answer : Pyrometallurgy
Description : Roasting of metallurgical ores is done mainly to (A) Dehydrate it (B) Sinter the ore (C) Remove CO2 & H2O (D) Remove arsenic & sulphur
Last Answer : (D) Remove arsenic & sulphur
Description : Sulphur removal by heating of pyrite ore in presence of air is called its (A) Reduction (B) Roasting (C) Calcination (D) Smelting
Last Answer : (B) Roasting
Description : __________ is an ore concentrating metallurgical process involving a chemical change. (A) Electromagnetic separation (B) Froth floatation (C) Roasting (D) None of these
Last Answer : (C) Roasting
Description : Iron ore hematite is concentrated using (A) Electromagnetic separation mainly (B) Gravity separation (C) Froth floatation (D) Roasting
Last Answer : (B) Gravity separation
Description : The product (s) of roasting of a sulphide ore is (are) (A) Oxide only (B) Sulphate only (C) Oxide and sulphate (D) Dependent on temperature and partial pressure of oxygen & sulphur dioxide
Last Answer : (A) Oxide only
Description : Which of the following is an ore dressing operation? (A) Classification (B) Smelting (C) Roasting (D) None of these
Last Answer : Option A
Description : Pick up the correct statement from the following: (A) Roasting is not necessary if iron ore is an oxide (B) Impurities float on the molten iron as slag (C) The slag contains lime about 45% (D) All the above
Last Answer : Answer: Option D
Description : The use of heat treatment of ore that includes smelting and roasting is termed as : (1) Electrometallurgy (2) Hydrometallurgy (3) Pyrometallurgy (4) Cryometallurgy
Description : Heating of a ore below its melting point in the absence of air is known as (1) Refining (2) Calcination (3) Roasting (4) Smelting
Last Answer : Calcination
Description : Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting
Last Answer : (A) Roasting/reduction of ores
Description : Roasting of copper pyrites is done:
Last Answer : Roasting of copper pyrites is done: A. to remove moisture and volatiaile impurities B. C. D.
Description : Copper is refined by - (1) roasting (2) oxidation (3) electrolysis (4) zone refining
Last Answer : (1) roasting Explanation: Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ... ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.
Description : By which process copper is refined ------? A. Roasting (Answer) B. Oxidation C. Zone Refining D. Electrolysis
Last Answer : A. Roasting (Answer)
Description : Copper is refined commercially by a process of: w) smelting x) electrolysis y) sublimation z) roasting
Last Answer : ANSWER: X -- ELECTROLYSIS
Description : Copper is refined by (1) roasting (2) oxidation (3) electrolysis (4) zone refining
Last Answer : roasting
Description : In the extraction of iron in the blast furnace, the reducing agent for the ore is
Last Answer : In the extraction of iron in the blast furnace, the reducing agent for the ore is A. Carbon monoxide B. Carbon dioxide C. Carbon D. Silica
Description : The main reactions occuring in blast furnace during extraction of iron from haematite ore…..
Last Answer : The main reactions occuring in blast furnace during extraction of iron from haematite ore .. A. `Fe_(2)O_ ... 3Cto2Fe+3CO` D. `CaO+SiO_(2)toCaSiO_(2)`
Description : Petroleum coke is used mainly in the (A) Discoloration of yellow glycerine (B) Sugar refining (C) Manufacture of carbon electrode (D) Blast furnace for reduction of iron ore
Last Answer : (C) Manufacture of carbon electrode
Description : Uranium is recovered from its ore (pitchblende) by (A) Froth floatation technique (B) Leaching with sulphuric acid (C) Smelting in a furnace (D) Dissolving in water
Last Answer : (B) Leaching with sulphuric acid
Description : __________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace. (A) Bauxite (B) Limestone (C) Quartz (D) Manganese
Last Answer : (B) Limestone
Description : Which is the main reducing agent during production of iron from iron ore in a blast furnace? (A) C (B) CO (C) CO2 (D) H2
Last Answer : (B) CO
Description : The main charge in blast furnace is usually (A) Iron ore & coke (B) Iron ore, coke & air (C) Limestone, coke & iron ore (D) Limestone, sand & iron ore
Last Answer : Limestone, coke & iron ore
Description : Which of the following contributes maximum as main source of sulphur in the blast furnace charge? (A) Sinter (B) Coke (C) Iron ore (D) Limestone
Last Answer : Coke
Description : Pick up the correct statement from the following: (A) In basic Bessemer process, the steel heats the converter (B) In open-hearth process, the furnace heats the steel (C) In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore (D) All the above
Description : Which of the following materials is used along with iron ore and limestone to produce iron in a modern blast furnace? w) coke x) cementite y) coal z) bauxite
Last Answer : ANSWER: W -- COKE
Description : (a) Write one example for each of decomposion reaction carried out with help of (i) Electricity (ii) Heat (iii) Light (b) Which of the following statements is correct and why copper can displace silver from silver nitrate and silver can displace copper from copper sulphate solution. -Chemistry
Last Answer : Thi is the Answer:
Description : Write chemical equation reactions taking place when carried out with the help of (a) Iron reacts with steam (b) Magnesium reacts with dil HCl (c) Copper is heated in air. -Chemistry
Last Answer : This is the Answer.
Description : 40 No load test on a transformer is carried out to find A. Copper loss B. magnetising current C. Magnetising current and loss D. Efficiency of the transformer
Last Answer : C. Magnetising current and loss
Description : 22 No load test on a transformer is carried out to find A. copper loss B. magnetising current C. Magnetising current and no load loss D. Efficiency of the transformer
Last Answer : C. Magnetising current and no load loss
Description : Galvanization of iron is carried out using (1) Zinc (2) Tin (3) Copper (4) Chromium
Last Answer : Zinc
Description : 10.(a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. What type of ore is this? What steps will be required to obtain metal from the enriched ore. , (b) ... in coin and colour of the solution ? Write balanced chemical equation of the reaction involved. -Chemistry
Last Answer : (a) Carbonate ore: (i) Calcination: Carbonate ore is heated in limited supply of air and oxide is obtained, e.g. (b) Copper, being more reactive than silver will displace silver from silver nitrate ... and there will be deposition of silver on copper coin. The colour of solution will turn to blue.
Description : An ore contains 12% copper. How many kilograms of the ore are required to get 69 kg of copper? -Maths
Last Answer : 579 kg is the answer
Description : Write the name and symbol of copper [ Copper] main ore ?
Last Answer : The main ore of copper is called Copper Pyrites or Chalcopyritis and its symbol is CuFeS2 .
Description : Which ore contains both iron and copper?
Last Answer : Which ore contains both iron and copper? A. Cuprite B. Cualcocite C. Chalcopyrite D. Malachite and azurite are ores of copper
Description : Statement-I : `CuFeS_(2)` is concentrated by froath floatation method Statement-II : `CuFeS_(2)` is main ore of copper.
Last Answer : Statement-I : `CuFeS_(2)` is concentrated by froath floatation method Statement-II : `CuFeS_(2)` is main ore of copper.
Last Answer : Which ore contains both iron and copper? A. Chalcopyrite B. Malachite C. Cuprite D. Azurite
Description : The most suitable method for extraction of copper from low grade sulphide ore is
Last Answer : The most suitable method for extraction of copper from low grade sulphide ore is A. Smelting ... process C. Leaching process D. Electrolytic process