Description : Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore? (A) High fusibility & fluidity (B) High thermal conductivity (C) Low density (D) High chemical activity
Last Answer : B) High thermal conductivity
Description : The slag formed in the blast furnace during the extraction of iron from haematite is
Last Answer : The slag formed in the blast furnace during the extraction of iron from haematite is A. `Ca_(3)(PO_(4))_(2)` ... (3)` C. `FeSiO_(3)` D. `MnSiO_(3)`
Description : How is the slag obtained in the extraction of iron useful?
Last Answer : Slag obtained in blast furnace is used as one of theraw materials of glass and cement.
Description : The chemical composition of slag formed during the smelting process in the extraction of copper is :-
Last Answer : The chemical composition of slag formed during the smelting process in the extraction of copper is :- A. `Cu_(2)O+ ... C. `CuFeS_(2)` D. `Cu_(2)S+FeO`
Last Answer : The chemical composition of slag formed during the smelting process in the extraction of copper is :- A. `Cu_(2)O+ ... . `CuFeS_(2)` D. `Cu_(2)S++FeO`
Description : In the extraction of copper, the slag formed in the blast furnace is
Last Answer : In the extraction of copper, the slag formed in the blast furnace is A. `CaSiO_(3)` B. `FeSiO_(3)` C. `FeSiO_(3)` D. `MnSiO_(3)`
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 : Limestone is added in the blast furnace (during pig iron manufacture) to (A) Form slag by combining with impurities (B) Supply heat by undergoing exothermic reaction with impurities (C) Reduce the coke consumption (D) Reduce slag viscosity
Description : Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material? (A) Slag cement (B) Glasses (C) Porcelain/Potteries (D) Teflon
Last Answer : (D) Teflon
Description : Cast iron contains phosphorus as impurity. In Bessemerisation of this cast iron the slag formed is
Last Answer : Cast iron contains phosphorus as impurity. In Bessemerisation of this cast iron the slag formed is A. `FePO_(4)` B. ` ... (4)` D. `Zn_(3)(PO_(4))_(2)`
Description : Slag is a name given for - (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate
Last Answer : (3) molten alumina Explanation: Slag is a partially vitreous byproduct of the process of smelting ore, which separates the desired metal fraction from the unwanted fraction. A good example is steelmaking ... separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.
Description : Why is slag collected above molten iron?
Last Answer : Slag is lighter than molten iron and collects above molten iron. Slag prevents oxidations of molten iron back into iron oxide.
Description : Raw materials used for producing __________ cement does not contain iron oxide. (A) Waterproof (B) Slag (C) White (D) Pozzolan
Last Answer : (C) White
Description : Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag. (A) 2 (B) 3 (C) 0.8 (D) 6
Last Answer : (B) 3
Description : furnace slag is mainly molten (A) Sand (B) Magnesium silicate (C) Calcium silicate (D) Iron pyrite
Last Answer : Option C
Description : Wrought iron is not (A) Ductile & resistant to corrosion/rusting (B) Weldable easily (C) Having uniform strength in all directions (D) Having maximum tensile strength along the lines of slag distribution
Description : Dephosphorization of molten pig iron is favoured by (A) Oxidising and basic slag (B) Reducing and basic slag (C) High activity co-efficient of phosphorous in metal (D) Oxidising and neutral slag
Last Answer : Option B
Description : Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight (A) 1.5 (B) 3 (C) 5
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All the above
Last Answer : Answer: Option D
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All these
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
Description : Slag is a name given for (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate
Last Answer : molten alumina
Description : During the extraction of iron in the blast furnace ,
Last Answer : During the extraction of iron in the blast furnace , A. Coke acts as reducing agent in the lower ... and Coke acts as reducing agent in the upper zone
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 : 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 : 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 : Flux addition during smelting of ore is done to (A) Remove impurities/gangue (B) Enhance rate of reaction (C) Accelerate reduction of ore (D) Separate slag from metal
Last Answer : (A) Remove impurities/gangue
Description : The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as (A) Low-heat Portland cement (B) Rapid hardening Portland cement (C) Portland blast slag cement (D) Portland pozzolana cement
Last Answer : Answer: Option A
Description : During pudding (A) Molten metal is kept clear of the fuel (B) Carbon is converted into carbonic acid gas (C) Silicon forms a slag (D) All the above
Description : Name the material which is separated from molten steel during chemical reaction of A.T welding? (i) Aluminium oxide (slag). * (ii) Ferrous Oxide (iii) Aluminium (iv) Ferrous
Last Answer : (i) Aluminium oxide (slag). *
Description : Oil produced by solvent extraction (A) Has low free fatty acid content (B) Is odourless (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (D) Neither (A) nor (B)
Description : 5. In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following: (A) Jet of water at high pressure (B) Blast of air (C) Mixture of water and air (D) Rain of molten lead
Last Answer : Option D
Description : The reaction (s) which does (do) not occur in the reduction zone in the extraction of iron from haematite ore is (are)
Last Answer : The reaction (s) which does (do) not occur in the reduction zone in the extraction of iron from haematite ore ... ` D. `CaO + SiO_(2) rarr CaSiO_(3)`
Description : Consider the following statements and arrange in the order of true/false as given in the codes.`S_(1)`: In extraction of iron from haematite ore, the
Last Answer : Consider the following statements and arrange in the order of true/false as given in the codes.`S_(1)`: In ... `. A. TFTT B. FTFF C. FFTT D. TFFT
Last Answer : The reaction (s) which does (do) not occur in the reduction zone in the extraction of iron from haematite ore ... ` D. `CaO + SiO_(2) rarr CaSiO_(2)`
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 : Consider the following statements in the extraction of iron from haematite: (I) `CO`is the main reducing agent (II) `Fe_(2)O_(3)`is used to oxidise th
Last Answer : Consider the following statements in the extraction of iron from haematite: (I) `CO`is the main reducing agent (II) ... I, II and III D. I, II and IV
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 : In the extraction of iron from haematitie, the charge used is haematite, coke and lime stone in the following weight ration
Last Answer : In the extraction of iron from haematitie, the charge used is haematite, coke and lime stone in the following weight ration ... C. `8:1:4` D. `1:4:8`
Description : Which of the following process is used in the extraction of iron from the Iron ore?
Last Answer : Reduction
Description : Why is extraction of aluminium not commercially viable by using reducing agents like coke? OR Coke is used in the extraction of iron but not in the extraction of aluminium. Why? OR Aluminium cannot be extracted by heating bauxite and coke. Why?
Last Answer : Oxygen of aluminium oxide cannot be easily taken away by reducing agents like coke.
Description : What is the role of coke in the extraction of iron?
Last Answer : Coke is a good reducing agent. It reduces iron oxide to iron. It is also a good fuel which supplies heat energy for the chemical reactions.
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 of the following statement(s) is/are correct about slag?
Last Answer : Which of the following statement(s) is/are correct about slag? A. The chemical composition of slag ... is of slag. D. The slag is fusible matter
Description : What is the viscosity of slag of blast furnace?
Last Answer : What is the answer ?
Description : Skin becomes wrinkled in the old age due to (a) loss of elastic tissue in the dermis (b) considerable slag in the rate of dividing cells in the stratum germinativum (c) gradual loss of elasticity in the subcutaneous layer (d) all of these
Last Answer : Ans:(b)