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 : 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 : __________ is used as a flux in the smelting of copper ore like chalcopyrite. (A) Coke breeze (B) Lime powder (C) Silica/quartz (D) Dolomite
Last Answer : (C) Silica/quartz
Description : The highest temperature is achieved in which type furnance?
Last Answer : Electric
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 : When copper pyrites is roasted in excess of air, a mixture of `CuO + FeO` is formed. `FeO` is present as impurity. This can be removed as slag during
Last Answer : When copper pyrites is roasted in excess of air, a mixture of `CuO + FeO` is formed. `FeO` is present ... a basic flux D. CaO, which is a basic flux
Description : Pick up the correct statement from the following: (A) The percentage of absorption for firebricks varies from 5 to 10 (B) The percentage of silica in silica bricks is to the extent of about 95 to 97 ... to 2 percent of lime in silica bricks is added to act as binding material (D) All the above
Last Answer : Answer: Option D
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 : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined with haematite. Reason: Haematite oxidises
Last Answer : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined ... -1 is false but Statement -2 is true
Description : In reverberatory furnace, charge is heated mainly by (A) Conduction (B) Natural convection (C) Radiation of heat from the roof of the combustion chamber (D) None of these
Last Answer : (C) Radiation of heat from the roof of the combustion chamber
Description : Which is the most thermally efficient furnace? (A) Reheating furnace (B) Reverberatory furnace (C) Rotary kilns (D) Boiler furnace
Last Answer : (D) Boiler furnace
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 : Which of the following is a directly fired intermittent furnace? (A) Walking beam reheating furnace (B) Reverberatory furnace (C) Tower furnace (D) Tunnel kiln
Last Answer : (B) Reverberatory furnace
Description : Pick out the correct statement. (A) In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity (B) With increase in temperature, the selectivity of the solvent used ... in solvent extraction is unity at the plait point (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given L/V' ratio (B) The extraction per unit ... and its crosssection is wider at the bottom (D) Vander wall adsorption is also called chemisorption
Last Answer : (D) Vander wall adsorption is also called chemisorption
Description : Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction (A) Decreases with decrease of thickness of the flakes (B) Increases with the increasing flake size ... considerably with the rise of temperature (D) Decreases as the moisture content of flakes increases
Last Answer : (D) Decreases as the moisture content of flakes increases
Description : The flux used in the extraction of iron from Haematite in te blast furnace is `"["EAM(ENG)2014"]"`
Last Answer : The flux used in the extraction of iron from Haematite in te blast furnace is `"["EAM(ENG)2014"]"` A. Lime stone B. Silica C. Coke D. CO
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 : The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag. (A) Fluidity (B) Basicity (C) Acidity (D) Viscosity
Last Answer : Option A
Description : Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly. (a) Lime (b) Silica (c) Alumina (d) Iron oxide
Last Answer : Lime is a common ingredient in cement. It is typically added in small amounts to help the cement set more quickly. Adding too much lime can cause the cement to set slowly. Alumina, silica, and iron oxide are also common ingredients in cement, but they do not have an effect on the setting time.
Description : Heating pyrites in air to remove sulphur is known as which name? -General Knowledge
Last Answer : The answer is 'Roasting'
Last Answer : answer:
Description : Can pyrites be silver in color?
Last Answer : Need answer
Description : The ore of Aluminium is - (1) Fluorspar (2) Bauxite (3) Chalco pyrites (4) Hematite
Last Answer : (2) Bauxite Explanation: Bauxite, an aluminium ore, is the world's main source of aluminium. Bauxite is priinarily comprised of aluminum oxide compounds (alumina), silica, iron oxides and titanium dioxide. It is refined through the Bayer chemical process into alumina.
Description : Burning pyrites ore gives out – (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas
Last Answer : (2) Sulphur dioxide gas Explanation: The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS9. Pyrite remains in commercial use for the production of sulfur dioxide, for use in such applications as the paper industry, and in the manufacture of sulfuric acid.
Description : Heating pyrites in air to remove sulphur is known as which name?
Last Answer : Roasting
Description : Chance process is used for the (A) Cleaning of coal (B) Concentration of iron ore (C) Concentration of pyrites (D) Water treatment
Last Answer : (A) Cleaning of coal
Description : The chemical formula of iron pyrites is— (A) FeSO 4 (B) FeS (C) FeS 2 (D) Fe 2 (SO 4 ) 3
Last Answer : (C) FeS 2
Description : Average sulphur content in Indian pyrites is about __________ percent. (A) 15 (B) 35 (C) 55 (D) 70
Last Answer : (B) 35
Description : Which of the following is an endothermic reaction? (A) Absorption of SO3 in 98% H2SO4 (B) C + H2O = CO + H2 (C) Thermal dissociation of iron pyrites (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : The chamber process is (A) Preferred over contact process for producing 98 to 100% H2SO4 and various oleums (B) Non-catalytic and operates only on pyrites (C) A batch process for directly producing high strength (98 to 100%) H2SO4 (D) None of these
Last Answer : (D) None of these
Description : Upto a maximum of 72% of iron, is available in (A) Magnetite (B) Limonite (C) Siderite (D) Iron pyrites
Last Answer : Answer: Option A
Description : The ore of Aluminium is (1) Fluorspar (2) Bauxite (3) Chalco pyrites (4) Hematite
Last Answer : Bauxite
Description : Burning pyrites ore gives out (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas
Last Answer : Sulphur dioxide gas
Description : Why lime stone is added in the extraction of lead from galena ?
Last Answer : Why lime stone is added in the extraction of lead from galena ? A. It prevents the formation of ... moves the impurity of iron oxide as fusible slag.
Description : Why lime stone is added in the extraction of lead from galena?
Last Answer : Why lime stone is added in the extraction of lead from galena? A. It prevents the formation of ... moves the impurity of iron oxide as fusible slag.
Description : Which of the following is not added during the extraction of silver by cyanide process?
Last Answer : Which of the following is not added during the extraction of silver by cyanide process? A. NaCN B. Air C. Zn D. `Na_(2)S_(2)O_(3)`
Description : Why is sodium carbonate added during solvent extraction?
Last Answer : It is usually added during an extraction in order to make thesolution alkaline. Often times, this aids in the efficiency of theextraction.
Description : What happens when lime stone is not added during the extraction of iron?
Last Answer : If limestone is not added to charge during the extraction of iron, the blast furnace will get blocked.
Description : State the role of lime stone in the extraction of iron from haematite. Or Why is lime stone added during the extraction of iron?
Last Answer : Limestone reacts with the sand present as impurity in the ore forming calcium silicate which is taken out of the blast furnace as slag.
Description : Function of the flux added during smelting is
Last Answer : Function of the flux added during smelting is A. to make the ore porous B. to facilitate reduction C. to remove gangue D. to facilitate oxidation
Description : The product obtained when gangue is added with flux?
Last Answer : Slag
Description : Upto the critical radius of insulation, added insulation, will (A) Increase the heat loss (B) Decrease heat loss and will have no effect beyond that (C) Decrease heat flux (D) Reduce convection heat loss compared to conduction heat less
Last Answer : Option B
Description : If the iron ore contains clay as an impurity, the flux added during calcination, is (A) Clay (B) Lime stone (C) Argillaceous iron ore (D) All the above
Last Answer : Answer: Option B
Description : In a counter-current extractor, as the axial mixing increases, the extraction efficiency (A) Increases (B) Decreases (C) Remains unchanged (D) Depends on the pressure of the system
Last Answer : (B) Decreases