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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An important ore of zinc metal is:A. CalamineB. CryoliteC. GibsiteD. Malachite |
| Answer» Correct Answer - A | |
| 2. |
An important oxide ore if iron isA. HaematiteB. SideriteC. PyritesD. Malachite |
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Answer» Correct Answer - A Haematite `Fe_(2)O_(3)` |
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| 3. |
Which of the following faction is of no significance for roasting sulphide ores to the oxide and not subjecting the sulphide ores in carbon reduction directly ?A. `CO_(2)` is thermodynamically more stable than `CS_(2)`B. Metal sulphides are less stable than the corresponding oxidesC. `CO_(2)` is more volatile than `CS_(2)`D. Metal sulphides are thermodynamically more stable than `CS_(2)` |
| Answer» Correct Answer - B | |
| 4. |
Commercially important ore of Lead isA. SideriteB. HaematiteC. GalenaD. None of these |
| Answer» Correct Answer - C | |
| 5. |
Which of the following srtatement above the advantage of masting of sulphide are before reduction is not true?A. Carbon and hydrongen are suitable reducing agents for metal sulphidesB. The `Delta""_(r)G^(0)` of the sulphide is greater than those for `CS_(2) and H_(2)S`C. The `Delta""_(r)G^(0)` is negative for roasting for sulphide ore to oxideD. Reasting of the sulphide to the oxide is thermodynamially feasible |
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Answer» Correct Answer - A Carbon nd hydrogen are not suitable reducing agent of metla sulphides. They are suitable reducing ageng for metal oxide. |
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| 6. |
The reduction of zinc oxide with coke occurs at temperatureA. Greater than that for CuOB. Less than that for CuOC. Less than that for `Ag_(2)O`D. Equal to that for CuO |
| Answer» Correct Answer - A | |
| 7. |
In blast furnace, iron oxide is reduced byA. SilicaB. COC. CarbonD. Lime stone |
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Answer» Correct Answer - B `Fe_(2)O_(3) to 3CO to 2Fe+3CO_(2)` |
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| 8. |
The important advantage(s) of Lintz and Donawitz (L.D.) process for the manufacture of steel is (are)A. The process is very quickB. Operation costs are lowC. Better quality steel is obtainedD. Scrap iron can be used |
| Answer» Correct Answer - A::C::D | |
| 9. |
The metallurgical process in which a metal is obtained in a fused state is calledA. SmeltingB. RoastingC. CalcinationD. Forth floatation |
| Answer» Correct Answer - A | |
| 10. |
In the metallurgical extraction of zince from `ZnO` the reducting agent used isA. Carbon monoxideB. Sulphure dioxideC. Carbon dioxideD. Nitric oxide |
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Answer» Correct Answer - A `ZnO +CO to CO_(2) Zn` |
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| 11. |
Smetling is done inA. Blast furnaceB. Muffle furnaceC. Open-hearth furnanceD. Electric furnace |
| Answer» Correct Answer - A | |
| 12. |
When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, thenA. An acidic flux is neededB. A basic flux is neededC. Both acidic and basic flux are neededD. Neither of them is needed |
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Answer» Correct Answer - B `underset("Acidic impurity")(SiO_(2))+underset("Basic flux")(CaO) to underset("Slag")(CaSiO_(3))` |
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| 13. |
Calcination is used in matallurgy for removal ofA. Water and sulphideB.C. Water and `CO_(2)`D. `H_(2)O and H_(2)S` |
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Answer» Correct Answer - B `ZnCO_(3)to ZnO+CO_(2)` In calcination ore is heated in obsence of air in a reverberatory or blast furnace. |
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| 14. |
The cheap and having hight melting point compound used in furnace isA. PbOB. CaOC. HgOD. ZnO |
| Answer» Correct Answer - B | |
| 15. |
The role of calcination in metallurgical operation isA. To remove moistureB. To decompose carbonateC. To drive off organic matterD. To achieve all the above |
| Answer» Correct Answer - D | |
| 16. |
Refractory metals are used in construction of furnances becauseA. They can withstand high temperatureB. They are chemically inertC. Their melting point is highD. None of these |
| Answer» Correct Answer - A | |
| 17. |
Silver metal is extracted by cyanide process from silver glance `(Ag_(2)S)`. The ore is concentrated through forth floatation process. The concentrated ore is then leached and solution is treated with reducing agent to get spongy silver which is then purified by fusion with an oxidsing agent followed by electrolysis. Leaching of `Ag_(2)S` is carried out by heating it with a dilute solution ofA. NaCN aloneB. NaCN in presence of `O_(2)`C. HClD. NaOH |
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Answer» Correct Answer - B Leaching of `Ag_(2)S` measn dissolution. `2Ag_(2)S+8NaCN+O_(2) 2H_(2) O to 4Na[Ag(CN_(2))]+4NaOH+2S` |
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| 18. |
Formula of Feldspar isA. `K_(2) O. Al_(2)O_(3). 6 SiO_(2)`B. `K_(2) O. Al_(2)O_(3). 6 Si_(2). O_(2). 2H_(2)O`C. `Al_(2) O_(3). 2SiO_(2). 2H_(2)O`D. `3MgO.4 SiO_(2). H_(2)O` |
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Answer» Correct Answer - A Felspar is `K_(2)O.Al_(2)O_(3).6SiO_(2)` |
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| 19. |
Silver metal is extracted by cyanide process from silver glance `(Ag_(2)S)`. The ore is concentrated through forth floatation process. The concentrated ore is then leached and solution is treated with reducing agent to get spongy silver which is then purified by fusion with an oxidsing agent followed by electrolysis.A. Silver is precipitated from an aqueous solution of sodium argntocyanide by addingB. Zinc dustC. Copper powderD. Sodium amalgam |
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Answer» Correct Answer - A `2Na[Ag(CN)_(2)]+underset("dust")(Zn) to underset(["Via Hydrometallurgical process"])(Na[Zn(CN)_(4)]+2Ag)` |
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| 20. |
Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnance such that the contents undergo self-reduction, the weight (in kg) of Pb produced per kg of `O_(2)` consumend is _______ (Atomic weights in g `mol^(=1):O=16,S=32,Pb=207` |
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Answer» Correct Answer - D (6.47) `PbS+O_(2) to PbSO_(2)` `(1000)/(32)mol (1000)/(32) xx207 gm` mol of Pb= mol of`O_(2)` `=(10000)/(32)` mol `:.` Mass of Pb `=(1000)/(32)xx207g` `=(207)/(32)kg =6.47 `kg |
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| 21. |
Calcination is the process of heating the oreA. In a blas furnaceB. In absence of airC. In Presence of airD. None of these |
| Answer» Correct Answer - B | |
| 22. |
Upon heating with `Cu_(2)S` the reaction (s) that give copper metal is /areA. `CuFeS_(3)`B. `CuO`C. `Cu_(2)O`D. `CuSO_(4)` |
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Answer» Correct Answer - B::C::D `Cu_(2)S+2CuO to 6Cu+SO_(2)` `Cu_(2)S+2CuO to 4Cu+SO_(2)` `Cu_(2)S+CuO_(4) to 3Cu+2SO_(2)` |
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| 23. |
The autoreduction process is not used in the metallurgy ofA. HgB. CuC. PbD. Fe |
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Answer» Correct Answer - D `2HgS+3Oto2HgO+2SO` `2HgO+3O_(2)to 2Hg+SO_(2)` `2Cu_(2)+HgSto 2Cu_(2)O+2SO_(2)` `2PbS+3O_(2) to PbO+2SO_(2)` `2PbO+PbS to 3PbS to 3Pb+SO_(2)` This it has strong affinitty with oxygen than carbon |
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| 24. |
A sodium salt on treatment with `MgCl_(2)` gives white precipitate only on heating. The anion of the sodium salt is `:`A. `HCO_(3)^(-)`B. `CO_(3)^(2-)`C. `NO_(3)^(-)`D. `SO_(4)^(2-)` |
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Answer» Correct Answer - A `MgCl_(2)+2NaHCO_(3)rarr underset(("soluble"))(MgHCO_(3))+2NaCl,` `MgHCO_(3)overset(Delta)to MgCO_(3)darr +H_(2)O+CO_(2)` |
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| 25. |
Match the following `{:("List I","ListII"),("(A) Feldspar",(I) [Ag_(3)SbS_(3)]),("(B) Asbestors",(II) Al_(2)O_(3)H_(2)O),("(C) Pyrargyrite",(III) MgSO_(4).H_(2)O),("(D) Diaspore",(IV) KAlSi_(3)O_(8)),(,(V) CaMg_(3)(SiO_(3))_(4)):}`A. `{:(,(A),(B),(C),(D)),((a),IV,V,II,I):}`B. `{:(,(A),(B),(C),(D)),((b),IV,V,I,II):}`C. `{:(,(A),(B),(C),(D)),((c),IV,I,III,II):}`D. `{:(,(A),(B),(C),(D)),((d),II,V,IV,I):}` |
| Answer» Correct Answer - B | |
| 26. |
Identify the reaction that does not take place in a blast furnaceA. `2Fe_(2)O_(3)+3Cto4Fe+3CO_(2)`B. `CO_(2)+Cto2CO`C. `CaCO_(3)toCaO+CO_(2)`D. `CaO+SiO_(2)toCaSiO_(3)` |
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Answer» Correct Answer - C Blast furnance is frequency used for the extraction of iron and copper from their ores. Carbon and carbon monoxide reduce the metallic oxides to the free metals . Slag formation plays an important role in blast furnance as it covers the melted and thus protects the metal from being reoxidized. |
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| 27. |
Bauxide ore is made up of `Al_(2)O_(3) + SiO_(2) + TiO_(2) + Fe_(2) O_(3)`. This ore is treated with conc. `NaOH` solution at `500 K` and `35` bar pressure for a few hours and filtered hot. In the filtrate, the species present areA. `NaAl(OH)_(4)` onlyB. `Na_(2)Ti(OH)_(6)` onlyC. `NaAl(OH)_(4)andNa_(2)SiO_(3)` bothD. `Na_(2)SiO_(3)` only |
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Answer» Correct Answer - A In buxine ore, only `Al_(2)O_(3)` reacts with conc. NaOH and formed sodium meta aluminate. This, further dissolves in water `Al_(2)O_(3) +2H_(2)O +2NaOH underset(35 "bar")overset(500 K)rarr2NaAlO_(2) +3H_(2)O` `NaAlO_(2)+2H_(2)O to NaAl(OH)_(4)` |
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| 28. |
`Al(OH)_(3)` is amphoteric is nature. `Al-O` and `O-H` bonds can be borken with equal ease in `Al(OH)_(3)`.A. Statement 1 is true, statement 2 is true : statement 2 is a correct explanation for statement 1B. Statement 1 is true, statement 2 is true , statement 2 is not a correct explanation for statement 1C. Statement 1 is true, stetament 2 is falseD. Statement 1 is true, statement 2 is statement 2 is true |
| Answer» Correct Answer - C | |
| 29. |
Froth floatation process is used for the concentration ofA. Oxides oresB. Sulphide oresC. ChlorideD. Amalgams |
| Answer» Correct Answer - B | |
| 30. |
Asserton : Ethyl xantyhate is used as a collector in froth floatation process. Reason : Collectors depress the loatation property of one of the componenets of the ore and thus help in the separation of different minerals present in the same ore.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true and the reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false |
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Answer» Correct Answer - C Assertion is true but reason is false. Collectors absorbs themselves on polar groups to grains of ores and thus derive then on the surface to passs on into the fourth |
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| 31. |
Which is correctA. Galena :`Mg_(2)CO_(3)`B. Cassiterite `:CaCO_(3)MgCO_(3)`C. Dolomite `:SnO_(2)`D. Magnesite `:MgCO_(3)` |
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Answer» Correct Answer - D `MgCO_(3)` is the formula of magnesite. |
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| 32. |
Froth floatation process for the concentration of Cu illustrates the practical application ofA. adsorptionB. AbsorptionC. CoagulationD. Sedimentation |
| Answer» Correct Answer - A | |
| 33. |
The bicabonates of group 2 metals areA. Easily oxidized by airB. Stable only in solutionC. Unstable in solutionD. Stable to heat in solid state |
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Answer» Correct Answer - B The bicarbonates of group 2 metals are stable only in solution |
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| 34. |
An ore of tin containing `FeCrO_(4)` is concentrated by _____.A. Magenetic separationB. Froth floatationC. Electrostatic methodD. Gravity separation |
| Answer» Correct Answer - A | |
| 35. |
The process of ore dressing is carried out toA. Remove the silicenous mineralB. Add flux to the mineralC. Convert the ore to oxideD. Remove the poisonous impurities |
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Answer» Correct Answer - A Removal of silicious matter from ores is known as dressing ore concentraiton of are |
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| 36. |
Black Jack is an ore ofA. CrB. SnC. ZnD. Ni |
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Answer» Correct Answer - C Black Jack (ZnS), also, called zinc blende, is an ore of Zinc |
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| 37. |
Identify the alloy containing a non metal as a constituent in itA. InverB. SteelC. Bell metalD. Bronze |
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Answer» Correct Answer - B Stell: It always have few % of carbon. |
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| 38. |
`(Ag +Pb) alloy overset("Melt and add zinc")rarr (Ag +Pb +Zn) "melt" overset("Cool") rarr (LayerX)/(LayerY)` Select correct statements based on above scheme:A. Layer X contains Zn and AgB. Layer Y contains Pb and Ag but amont of silver in this layer is smaller than in layer XC. X and Y are immiscible layerD. All are correct statements |
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Answer» Correct Answer - D Zn and Pb in molten state are immiscible and form separate layers, zince being lighter forms upper layer. As is soluble in both. Hence, all statements are coreect. |
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| 39. |
The sunstance which is mixed with the ore for removel of impurities is termedA. SlagB. GangueC. FluxD. Catalyst |
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Answer» Correct Answer - C Flux is added during smelting it combines with binfusible gangue present in the ore to from a fusible mass know as slag. Flux Gangue `to` Slag. |
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| 40. |
Heating of pyrites in air for oxidation of sulphur is called Heating of ore in presene of air to remove sulphure impurities is calledA. RoastingB. CalcinationC. SmeltingD. Slagging |
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Answer» Correct Answer - A Roasting involves heating of the ore either alone or with some other material usually in presnece of air below its fusion temperature. In roasting, definite chemical changes like oxidation. Chlorination etc, take place `S+O_(2)toSO_(2)` |
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| 41. |
Aluminium is extracted from Alumina (`Al_(2)O_3` ) by electrolysis of a molten mixture ofA. `Al_(2)O_(3)+HF+NaAlF_(4)`B. `Al_(2)O_(3)+CaF_(2)+NaAlF_(4)`C. `Al_(2)O_(3)+Na_(3)AlF_(6)+CaF_(2)`D. `Al_(2)O_(3)+KF+Na_(3)AlF_(6)` |
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Answer» Correct Answer - C `Na_(3)AlF_(6) and CaF_(2)` increases and decreases M.P of `Al_(2)O_(3)` |
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| 42. |
The metal oxide which cannot be reduced to metal by carbon isA. `Al_(2)O_(3)`B. PbOC. ZnOD. `Fe_(2)O_(3)` |
| Answer» Correct Answer - A | |
| 43. |
According to Ellingham diagram the oxidation reaction of carbon and carbon monoxide may be used to reduce which one of the following oxides at the lowest temperature?A. `Al_(2)O_(3)`B. `Cu_(2)O`C. `MgO`D. ZnO |
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Answer» Correct Answer - B In the graph of `Delta_(r) G^(@) vs T` for fomation of oxides, the `Cu_(2)O` line is almost at the top. So, it is quite easy to reduce coke (both the line s of C,CO and C, `CO_(2) are at much `Cu_(2)Oto 2Cu+CO` |
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| 44. |
In the electrolysis of alumina, cryolite is added toA. Lower the melting point of alumianB. Increase the electrical conductivityC. Minimise the anode effectD. Remove impurities from alumina |
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Answer» Correct Answer - A::B In the electrolysis of alumina, cryolite is added. The function of crylite are : (i) To lower the meting point of alumina and (ii) To increases the electrical conductivity |
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| 45. |
Copper can be extracted fromA. KupfemickelB. DolomiteC. GalenaD. Malachite |
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Answer» Correct Answer - D Malachite `(Cu(OH)_(2).CuCO_(3))` |
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| 46. |
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?A. FeB. ZnC. MgD. Cu |
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Answer» Correct Answer - C Mg hs more `-DeltaG` value then alumina. So it will be in the lowe part of Ellingham diagram. Metlas which has more `-DeltaG` value can reduce those metals oxide which has less `-DeltaG` value |
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| 47. |
Match the extraction processes listed in column I with metals listed in column I. `{:(,"Column I",,"Column II"),((A),"Self reduction",(p),"Lead"),((B),"Carbon reduction",(q),"Silver"),((C),"Complex formation and displacement by metal",(r),"Copper"),((D),"Decomposition of iodide",(s),"Bron"):}` |
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Answer» Correct Answer - A::B::C::D "Selt reduction" " " `[{:(p, -"Lead"),(r,-"Copper"):}]` In head metal `{{:(,2PbS+3O_(2) to2PbO+2SO_(2)("Slef reduction")),(,2PO+PbS to 3Pb+SO_(2)):}` In copper metal `2Cu_(2)S+3O_(2) to 2Cu_(2)O+2SO_(2)` `Cu_(2)S+2Cu_(2) to 6Cu_(2)+2SO_(2)` (Slef reduction) (B) Carbon reduction p- Lead In lead metal `PbO+C to Pb+CO` `PbO+CO to Pb+CO_(2)` Carbon reduction process is used for the reduction of oxides of electropositive metals like , Fe, Pb etc. This reduction is carried out with coal or coke on strongly heating. (C) Comlex formation and displacement by meta. In silver metal Average `(Ag_(2)S)` mineral of Ag is treated iwth `0.7% NaCN` solution in presence of air, therefore, firstly soldium argentocyanide compled is formed which on heating with zinc meta, therefore, by displacement silver is isolated `Ag_(2)S+4NaCN to 2Na[Ag(CN)_(2)]+NaS` `2Na[Ag(CN)_(2)]+Zn to underset("soluble")(Na_(2)[Zn(CN)_(4)])+2underset("ppt")(Ag)darr` (D) Decomposition of iodide _______ (S) Boron By decomposition of iodide boron metal is isolated. `2BI_(3)overset("Wm heat")to 2B+3I_(2)` |
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| 48. |
In the metallurgy of zinc, flux is not used becauseA. Zinc ore has no impuritiesB. Zinc is volatile hence easily separatedC. Zinc reacts with fluxD. Flux is volatile |
| Answer» Correct Answer - B | |
| 49. |
Alumino-thermic process is used for metallurgy ofA. PbB. AgC. AlD. None of these |
| Answer» Correct Answer - D | |
| 50. |
How is limestone used in `Fe` extraction?A. Oxidation of Fe oreB. Reduction of Fe oreC. Formation of slagD. Purification of Fe formed |
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Answer» Correct Answer - C Lime stone `(CaCO_(3)` is used for formation of slag in Fe extraction `underset("Line stone")(CaCO_(3))to CaO+CO_(2)uarr` `CaO+underset("Gangue or impurity") (SinO_(2))to underset("slag")(CSiO_(3))` |
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