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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.
| 151. |
The underlying of blast furnace is made ofA. Fire clay bricksB. Silical bricksC. graphiteD. Basic bricks |
| Answer» Correct Answer - A | |
| 152. |
The removal of impurities from an oreA. CalcinationB. LevigationC. SlaggingD. Refining |
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Answer» Correct Answer - C The removal of impurities from an ore by forming a fusible (molten) mass is called slagging. |
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| 153. |
Which of the following concentration processes will you use when the gangue is light ?A. Gravity seperationB. Magnetic seperationC. Froth floatationD. None of these |
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Answer» Correct Answer - A Gravity separation method helps in washing away the lighter gangue particles with the help of a stream of water. |
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| 154. |
The main function of roasting isA. to remove the volatile matterB. to convert the ore into oxideC. Both (A) and (B)D. and make slag. |
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Answer» Correct Answer - C The main function of roasting is to remove volatile impurities and to convert the ore into oxide. |
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| 155. |
Extraction of zinc blende is achieved byA. Electrolytic reductionB. Roasting followed by reduction with carbonC. Roasting followed by reduction with other metalsD. Roasting followed by self reduction. |
| Answer» Correct Answer - B | |
| 156. |
An important ore of magensium isA. MalachiteB. CassiteriteC. CarnalliteD. Galena |
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Answer» Correct Answer - C In the commercial electrochemical process for aluminium extraction the elctrolyte used is a molten mixture of `Al_(2)O_(3)` (alumina ) and `Na_(3)AlF_(6)` (cryolite). |
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| 157. |
The formula of azurite is `:`A. `Cu_(2)S`B. `CuFeS_(2)`C. `Cu(OH)_(2)* 2CuCO_(3)`D. `Cu_(2)O` |
| Answer» Correct Answer - C | |
| 158. |
Stainless steel containsA. 60% Fe, 27% Cr, 10% Ni, 3% CB. 69% Fe, 17 % Cr, 12% Ni, 2% CC. 73% Fe, 18% Cr, 8% Ni, 1% CD. 73% Fe, 17% Cr, 9% Ni, 1%C |
| Answer» Correct Answer - B | |
| 159. |
The percentage of carbon in pig iron, wrougth iron and cast iron is in the order of ________.A. pig iron `lt ` cast iron `gt ` wrought ironB. pig iron `gt` cast iron `gt ` wrought ironC. pig iron = cast iron `lt` wrought ironD. pig iron `lt ` cast iron `lt ` wrought iron |
| Answer» Correct Answer - B | |
| 160. |
Percentage of carbon is pig iron is aboutA. 2B. 4C. 5D. 6 |
| Answer» Correct Answer - B | |
| 161. |
Which of the following elements is present as the impurity to the maximum extent in pig iron ?A. PhosphorusB. ManganeseC. CarbonD. Silicon |
| Answer» Correct Answer - C | |
| 162. |
Which of the following statements is correct according to the basic concepts of thermodynamics which govern the feasibility of a metallurgical process ?A. When the value of `DeltaG` is positive for the equation `DeltaG=DeltaH-T DeltaS`, the reaction will proceed.B. If reactant and products of two reactions are put together and net `DeltaG` is -ve , the overall reaction with occur.C. On increasing the temperature , the value of `DeltaG` reaction will occur.D. Feasibility of thermal oxidation of an ore can be established by Ellingham diagram in which a straight line shows the reduction will proceed. |
| Answer» Correct Answer - B | |
| 163. |
What is the percentage of carbon in pig iron and cast iron ? |
| Answer» Percentage of carbon in pig iron about `4%` while in cast iron it is about `3%`. | |
| 164. |
In the froth floatation process for the purification of minerals the particles float becauseA. they are lightB. they are insolubleC. their surface is preferentially wetter by oil.D. they bear an electrostatic charge. |
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Answer» Correct Answer - C The ore particles are wetted by oil and from lighter froth which may be named off. |
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| 165. |
In our solar systemA. density of larger planets is more than smaller planetsB. density of smaller planets is more than larger planetsC. density of a planet does not depend upon its size density of all the planets is the same.D. density of larger planets is more than smaller planets |
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Answer» Correct Answer - B |
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| 166. |
The only metal which exist in nature as well as combined state isA. AlB. AuC. PtD. Ag |
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Answer» Correct Answer - D |
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| 167. |
The formula of azurite is `:`A. `CuCO_(3).Cu(OH)_2`B. `2CuCO_(3).Cu(OH)_2`C. `CuCO_(2).Cu(OH)_2`D. `CuSO_(4).Cu(OH)_2` |
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Answer» Correct Answer - B `2CuCO_3.Cu(OH)_2` is azurite. |
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| 168. |
Assertion: Elements O, N and Ar are called atmophiles Reason: Atoms in Greek means which cannot be subdivided.A. Both A and R ar true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - C Elements O, N and Ar are called atmophile because atoms is Greek means vapour. |
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| 169. |
Assertion: Elements Fe, Ni, Co, Pd and Rb are called siderophiles. Reason: Sideros in Greek means iron.A. Both A and R ar true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - A Both Assertion A and R are true and R is the correct explanation of A. |
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| 170. |
Which of the follwing is not ore ?A. Zinc blendeB. MalachiteC. Pig ironD. Bauxite |
| Answer» Correct Answer - C | |
| 171. |
Which of the following minerals does not contain iron ?A. MagnesiteB. MagnetiteC. HaematiteD. Limonite |
| Answer» Correct Answer - A | |
| 172. |
Assertion: Nitrate ores are very rare. Reason: Atmos in Greek means which cannot be subdivided.A. Both A and R ar true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - B Both assertion A and reason R are true and R is not the correct explanation of A. |
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| 173. |
Assertioin: Silicate minerals are seldon used for hte extraction of a metal. Reason: Silicate minerals are very rare.A. Both A and R ar true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - D Silicate minerals are very common, however due to their less reactivity and high cost of extraction of metals from them, they are seldom used as ores. |
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| 174. |
The metal that occurs in the native state as well as in the combined form isA. SilverB. MagnesiumC. AluminiumD. Maganese |
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Answer» Correct Answer - A Silver occurs in the native state as well as in the combined form. |
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| 175. |
Most of the metals which occur in native tateA. are very reactiveB. do not form ionic compoundsC. have low densityD. have average density |
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Answer» Correct Answer - C Metals which are not reactive (noble metals) occur in native state in nature. |
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| 176. |
Assertioin: Platinum and gold occur in native state. Reason: Platinum and gold are expensive metals.A. Both A and R ar true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - C Platinum and gold occur in the native state because they are less reactive. |
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| 177. |
Which one of the following elements does not exist in the native form ?A. AuB. PtC. FeD. S |
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Answer» Correct Answer - C Fe does not exist in the native form. |
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| 178. |
Define the term flux. |
| Answer» A substance used to react with impurities to form slag. | |
| 179. |
Flux is used toA. Remove all impurities from ores.B. Reduce metal oxideC. Remove silicaD. Remove silica and undesirable metal oxide. |
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Answer» Correct Answer - D Flux is used to remove silica and undesirable metal oxide from the ore. |
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| 180. |
Carbonates ores are mostly ofA. group 1 elementsB. group 2 elementsC. transition elementsD. group 13 elements |
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Answer» Correct Answer - B |
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| 181. |
The non metal which is generally occur in the oxidised form in nature isA. CB. NC. SD. None of these. |
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Answer» Correct Answer - D |
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| 182. |
The non metal which occur only in the oxidised form in nature isA. carbonB. nitrogenC. chlorineD. None of these. |
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Answer» Correct Answer - A |
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| 183. |
Which is not an example of basic refractory material ?A. Calcined limestoneB. Calcined dolamineC. MagnetieD. Sand stone. |
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Answer» Correct Answer - A |
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| 184. |
Artificially produced sulphides during metallurgical operations is known asA. gangueB. fluxC. regulusD. None of these. |
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Answer» Correct Answer - A |
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| 185. |
Which of the following metal is leached by cyanide process ?A. AgB. NaC. AlD. Cu |
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Answer» Correct Answer - A Ag is leached by cyanide process. |
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| 186. |
A basic lining is given to a furnace by usingA. Calcined dolomiteB. Lime stoneC. HaematiteD. Silica |
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Answer» Correct Answer - A Calcined dolomite is used to give a basic lining to a furnace. |
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| 187. |
Pyrolusite is a/anA. Oxide oreB. Sulphide oreC. Carbide oreD. Not an ore. |
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Answer» Correct Answer - A Pyrolusite (`MnO_2` is an oxide ore. |
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| 188. |
Which of the following is not employed for refining of metal ?A. PolingB. LeachingC. ElectrolysisD. Liquation |
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Answer» Correct Answer - B Leaching is not employed for refining of metals. |
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| 189. |
The underlying of blast furnace is made ofA. GraphiteB. Silica rocksC. Fireclay bricksD. Basic bricks |
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Answer» Correct Answer - C The underlying of blast furnace is made of fireclay bricks -a refractory material. |
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| 190. |
Ferromagnetism is exhibited only belowA. 842 KB. 1042 KC. 742 KD. 642 K |
| Answer» Correct Answer - B | |
| 191. |
Dolomite can also be treated to get `MgCl_(2)` which in turn is electrolysed to get `Mg` (Dow natural brine process) . Give reactions for this process. |
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Answer» `MgCO_(3)overset(Delta)(to)MgCl_(2)+CO` `MgO+C+Cl_(2)overset(Delta)(to)MgCl_(2)+CO` At `700^(@)C`, `MgCl_(2)hArrMg^(2+)+2Cl^(-)` Cathode : `Mg^(2+)+2etoMg` Anode : `2Cl^(-)`-2etoCl_(2)uarr` |
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| 192. |
Calcination and roasting are generally carried out inA. Reverbratory furnaceB. Open hearth furnaceC. Blast furnaceD. Muffle furnace |
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Answer» Correct Answer - A Reverbratory furnace is used for roasting and calcination. |
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| 193. |
Copper is the most noble of first row transition metals and occurs in small deposits in several countries. Ores of copper include chalanthrite. `(CuSO_(4).5H_(2)O)`, atacanrite `[Cu_(2)Cl(OH)_(3)]` cuprite `(Cu_(2)O)`, copper glance `(Cu_(2)S)` nad malachite `[Cu_(2)(OH)_(2)CO_(3)]`. However, `80%` of the world copper production comes from the ore chalcopyrite `(CuFeS_(2))`. The extraction of ore chalcopyrite `(CuFeS_(2))`. The extraction of copper from chalcopyrite involves partial roasting, removal of iron nad self reduction. Partial roasting of chalcopyrite producesA. `Cu_(2)S` and FeOB. `Cu_(2)O` and FeOC. CuS and `Fe_(2)S_(3)`D. `Cu_(2)O` and `Fe_(2)O_(3)` |
| Answer» Correct Answer - A | |
| 194. |
Living organism contains iron inA. ChlorophyllB. HaemoglobinC. Eyes of animalsD. None of these |
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Answer» Correct Answer - B Iron is present in haemoglobin (blood). |
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| 195. |
The element vanadium is present inA. Sea weedsB. HaemoglobinC. ChlorophyllD. Sea cucumbers |
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Answer» Correct Answer - D Vanadium is found in sea weeds. |
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| 196. |
Sea weeds are important source ofA. ChlorineB. BromineC. IodineD. Zinc |
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Answer» Correct Answer - C Sea weeds contain iodine. |
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| 197. |
Galena is reported to have `23.8% PbS`. Calculate the volume of oxygen required at STP to roast `10 kg` galena to `PbO` and `SO_(2)`. |
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Answer» `underset(2xx238)(2PbS)+underset(3xx32)(3O_(2))to2PbO+2SO_(2)` `476g` of `PbS` requires `=96g"of"O_(2)` `10000xx(23.8)/(100)gPbS"requires"=480g"ofO_(2)` `"mole of" O_(2)=(480)/(32)=15` `:.` volume of oxygen at S.T.P `=15xx22.4=336` litres |
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| 198. |
The element with maximum cosmic abundance isA. HeliumB. HydrogenC. NitrogenD. Oxygen |
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Answer» Correct Answer - B Hydrogen is the element with maximum cosmic abundance. |
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| 199. |
The hot waste gases escape from blast furance areA. `SO_(2), N_(2), CO`B. `N_(2), CO_(2), SO_(2)`C. `N_(2), CO, CO_(2)`D. `NO_(2), CO, SO_(2)` |
| Answer» Correct Answer - C | |
| 200. |
Purification of aluminum by electroysic refiering is known asA. Baeyer processB. Hoope processC. SerpeckD. Hall process |
| Answer» Correct Answer - B | |