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 : 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 : A coal with high ash content is undesirable, as (A) It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber (B) The ash in molten condition gets absorbed in the pores of the ... and stick to the boiler tubes thereby reducing the heat transfer (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
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 : Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property? (A) Silicon (B) Phosphorus (C) Sulphur (D) None of these
Last Answer : (A) Silicon
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 : Bessemerisation is carried out for
Last Answer : Bessemerisation is carried out for A. Fe , B. Cu, C. Al, D. Silver
Last Answer : Bessemerisation is carried out for A. Magnesium B. Iron C. Silver D. Copper
Description : Bessemerisation is carried out for: (P) Fe, (Q) Cu, (R )Al, (S) Ag
Last Answer : Bessemerisation is carried out for: (P) Fe, (Q) Cu, (R )Al, (S) Ag A. I,II B. II,III C. III,IV D. I,III
Description : Describe Bessemerisation process with the help of chemical reaction & diagram.
Last Answer : After smelting the molten matte is then transferred to a Bessemer converter which is a pear shaped furnace made up of steel and internally lined with lime or magnesia. It is mounted on trunnions and can be ... surface of copper hence it is called as blister copper. It is 96 to 98% pure.
Description : A metal contains, metal oxide as impurity. The method used to refine this metal is
Last Answer : A metal contains, metal oxide as impurity. The method used to refine this metal is A. Poling B. Liqation C. Cupellation D. Distallation
Description : A semiconductor formed by addition of trivalent impurity is : a) P–Type b) N–Type c) Q–type d) M–Type
Last Answer : d) M–Type
Description : Which one of the following elements is present as a major impurity in pig iron ?
Last Answer : Which one of the following elements is present as a major impurity in pig iron ? A. graphite B. oxygen C. sulphur D. silicon
Description : Which one of the following impurity is not desirable in the soil used for brick formation a) Alkali b) Kankar c) Iron oxide d) Alkali & Kankar*
Last Answer : d) Alkali & Kankar*
Description : Which one of the following contains maximum percentage of carbon? (1) Cast iron (2) Stainless steel (3) Wrought iron (4) High speed steel
Last Answer : (1) Cast iron Explanation: Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape, containing 2 to 4.5 percent carbon. Steels contain less than 2% and usually less than 1% carbon, ... percent carbon. Wrought iron is an iron alloy with very low carbon (0.04 to 0.08%) content.
Description : Which one contains the least percentage of carbon? (A) Wrought iron (B) High speed steel (C) Cast iron (D) Pig iron
Last Answer : (A) Wrought iron
Description : Pick out the wrong statement. (A) Wrought iron contains about 0.02% carbon (B) Wrought iron cannot be easily forged and welded (C) The chilled cast iron does not contain graphite (D) Spheroidal grey cast iron contains graphite flakes
Last Answer : (B) Wrought iron cannot be easily forged and welded
Description : Cast iron contains __________ percent carbon. (A) 2.5 (B) 3.75 (C) 4.75 (D) 5.25
Last Answer : Option A
Description : Cast iron contains carbon approximately (A) 1.5% to 5.5% (B) 0.05% to 1.75% (C) 0.250 % (D) None to these
Last Answer : Answer: Option A
Description : Which one of the following contains maximum percentage of carbon ? (1) Cast iron (2) Stainless steel (3) Wrought iron (4) High speed steel
Last Answer : Cast iron
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 : During the extraction of iron, slag produced is
Last Answer : During the extraction of iron, slag produced is A. Zone of heat absorption B. Zone of reduction only ... only D. Zone of reduction and zone of fusion
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 : 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 : 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 : 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 : 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 : Slag is a name given for (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate
Last Answer : molten alumina
Description : Egg contains very little (A) Fat (B) Proteins (C) Carbohydrates (D) Calcium and phosphorus
Last Answer : Answer : C
Description : The tip of the match-stick contains – (1) phosphorus pentoxide (2) white phosphorus (3) red phosphorus (4) phosphorus trichloricle
Last Answer : (3) red phosphorus Explanation: A typical modern match is made of a small wooden stick or stiff paper. One end is coated with a material that can be ignited by frictional heat generated by ... in rows stapled into matchbooks. They are commonly sold by tobacconists and many other kinds of shops.
Description : One spear of raw broccoli contains ____ milligrams of phosphorus. a. 93 c. 100 b. 85 d. 79
Last Answer : c. 100
Description : Bone is used as a fertiliser because it contains the plant nutrient (1) Nitrogen (2) Phosphorus (3) Sodium (4) Calcium
Last Answer : Phosphorus
Description : The tip of the match-stick contains (1) phosphorus pentoxide (2) white phosphorus (3) red phosphorus (4) phosphorus trichloride
Last Answer : red phosphorus
Description : What is formed when white phosphorus is heated at 540 K in the absence of air? -Do You Know?
Last Answer : answer:
Description : $ The two strands of DNA run in an antiparallel directions DNA is formed of Deoxyribose sugar. Phosphorus and nitrogen bases called purines and pyrimi
Last Answer : $ The two strands of DNA run in an antiparallel directions DNA is formed of Deoxyribose sugar. Phosphorus and ... wrong D. If both As and R are wrong.
Description : Upon heating`KClO_(3)` in presence of catalytic amount of `MnO_(2)`, a gas `W` is formed. Excess amount of `W` reacts with white phosphorus to given `
Last Answer : Upon heating`KClO_(3)` in presence of catalytic amount of `MnO_(2)`, a gas `W` is formed. Excess amount of `W` ... PO_(4)` D. `N_(2)O_(5) and HPO_(3)`
Description : When `._(13)^(27)Al` is bombarded whith `alpha`-particles, a radioactive isotope of phosphorus `._(15)^(30)P` with the emission of …. Is formed
Last Answer : When `._(13)^(27)Al` is bombarded whith `alpha`-particles, a radioactive isotope of phosphorus ` ... A. neutrons B. protons C. positrons D. electrons
Description : When ethylalcohol reacts with `Br_(2)` in presencce of red phosphorus the compound formed is
Last Answer : When ethylalcohol reacts with `Br_(2)` in presencce of red phosphorus the compound formed is A. `C_(2)H_(6)` B. ` ... C. `CH_(3)Br` D. `C_(2)H_(5)Br`
Description : What is formed when white phosphorus is heated at 540 K in the absence of air?
Last Answer : Red phosphorus