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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. |
Statement-1: Sodium chloride is added during electrolysis of fused anhdrous magnesium chloride. Statement-2: Anhydous magnesium chloride is obtained by heating hydrated magnesium chloride, `MgCl_(2).6H_(2)O`A. Statement -1 is true, Statement-2 are true and Statement-2 is the correct explanation of Statement -1B. Statement -1 is true, Statement-2 are true and Statement-2 is not a correct explanation of Statement -1C. Statement-1 is true but Statement -2 is falseD. Statement-1 is false but Statement -2 is true |
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Answer» Correct Answer - c |
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| 152. |
In the metallurgy of Fe, when `CaCo_(3)` is added to blast furnace, calcicum ion appears asA. CaOB. metallicC. ggangueD. slag |
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Answer» Correct Answer - D |
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| 153. |
Assertion : Cryolite is used in electrolytic extraction of Al from alumina. It dissolves alumina. |
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Answer» Correct Answer - a |
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| 154. |
Which one of the following ores is best concentrated by froth flotation method:A. magnetiteB. cassiteriteC. galenaD. malachite. |
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Answer» Correct Answer - C |
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| 155. |
Why lime stone is added in the extraction of lead from galena ?A. It prevents the formation of `PbSO_(4)`B. It removes the impurity of silica as fusible slag.C. It converts lead silicate to lead oxideD. It moves the impurity of iron oxide as fusible slag. |
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Answer» Correct Answer - A::B::C |
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| 156. |
In the blast furncae the reaction that occurs in the zone of heat absorption isA. `CO_(2)+C to 2CO`B. `Fe_(2)O_(3)+3CO to 2Fe+3CO_(2)`C. `C+O_(2) to CO_(2)`D. `FeO+SiO_(2) to FeSiO_(3)` |
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Answer» Correct Answer - A |
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| 157. |
Blister copper is:A. Bessemer converteerB. Reverberatory furnaceC. Blast furnaceD. Electrolytic tank |
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Answer» Correct Answer - 1 |
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| 158. |
In the extraction of iron from haematitie, the charge used is haematite, coke and lime stone in the following weight rationA. `1:1:1B. `8:4:1`C. `8:1:4`D. `1:4:8` |
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Answer» Correct Answer - B |
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| 159. |
The slag formed in the blast furnace during the extraction of iron from haematite isA. `Ca_(3)(PO_(4))_(2)`B. `CaSiO_(3)`C. `FeSiO_(3)`D. `MnSiO_(3)` |
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Answer» Correct Answer - B |
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| 160. |
The flux used in the extraction of iron from Haematite in te blast furnace is `"["EAM(ENG)2014"]"`A. Lime stoneB. SilicaC. CokeD. CO |
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Answer» Correct Answer - A |
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| 161. |
`Ag_(2)S` ore Is mixed with NaCl and heated in the presence of air then products formed areA. `AgCl+Na_(2)SO_(4)`B. `AgCl+Na_(2)S`C. `AgCl+SO_(2)`D. `Ag+SO_(2)` |
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Answer» Correct Answer - 1 |
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| 162. |
Which one of the following forms of iron is called Mallaeable iron?A. Wrought ironB. Cast ironC. Pig ironD. Spiegel |
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Answer» Correct Answer - 1 |
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| 163. |
Ellingham Diagram is usefulA. To know thetempreature where phase transformation ocuursB. To know the temperature where metal oxide decompose on its ownC. To select suitable reducing agent for reduction of metal oxideD. All of the above |
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Answer» Correct Answer - 4 |
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| 164. |
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)` and CuB. `Cu_(2)O`C. MgOD. ZnO |
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Answer» Correct Answer - 2 |
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| 165. |
At the point of intersection for any two reactions for any two reactions in Ellingham diagram, the gibbs energy `(DeltaG)` changes becomesA. `gt1`B. 1C. `lt0`D. 0 |
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Answer» Correct Answer - 4 |
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| 166. |
A mixture of haematite, coke and limestone on heating in blast furnace gives molten iron metal. This is known asA. SmeltingB. CalcinationC. RoastingD. Liquition |
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Answer» Correct Answer - A |
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| 167. |
The iron formed in blast furnace is calle dA. Pig ironB. Wrought ironC. SteelD. Cast iron |
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Answer» Correct Answer - A |
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| 168. |
When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are :A. `{:(,,"Cathode","Anode"),(,"1)","Pure copper","Impure sample"):}`B. `{:(,,"Cathode","Anode"),(,"2)","Pure zinc","Pure copper"):}`C. `{:(,,"Cathode","Anode"),(,"3)","Impure sample","Pure copper"):}`D. `{:(,,"Cathode","Anode"),(,"4)","Impure zinc","Impure sample"):}` |
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Answer» Correct Answer - 1 |
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| 169. |
Silver containing lead as an impurity is not purified byA. PolingB. DistillationC. cupellationD. Levigation |
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Answer» Correct Answer - 3 |
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| 170. |
In which of the following the impure metal not purified by the oxidation of impuritesA. silver containing leadB. preparation of wrought iron from pig ironC. zinc containing iron and cadmiumD. bessemerisation of pig iron |
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Answer» Correct Answer - c |
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| 171. |
The copper metal is extracted from itsA. Carbonate oreB. Sulphide oreC. Sulphate oreD. Chloride ore |
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Answer» Correct Answer - B |
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| 172. |
The most impure form of iron isA. Wrought ironB. mild steelC. hard steelD. Cast iron |
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Answer» Correct Answer - D |
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| 173. |
Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to `[Au(CN)_(2)]^(-)`, Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio `[Zn(CN)_(4)]^(2-)`. Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution. The correct ionic reaction for the process are:A. Leaching of gold with `CN^(-)` is an oxidation reactionB. Argentite is oxide ore of silverC. In the precipitation of gold from the soluble complex, zinc acts as complexing and reducing agent.D. (A) and ( C) both |
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Answer» Correct Answer - a |
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| 174. |
Which of the following produced colourless gas with dil. `H_(2)SO_(4)`?A. MgB. FeC. ZnD. Cu |
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Answer» Correct Answer - 4 |
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| 175. |
Galcanization is theA. deposition of zinc on FeB. depositionof Al on FeC. deposition of tin on FeD. deposition of Cu on Fe |
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Answer» Correct Answer - 1 |
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| 176. |
Which one of the following metals has no action with dil.`H_(2)SO_(4)`?A. MgB. FeC. ZnD. Cu |
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Answer» Correct Answer - 4 |
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| 177. |
Amongst the various ores of a metal (M) (sulphide, carbonates, oxides, hydrated or hydroxides) two ores [X] and [Y] show the following reactivity. (i) [S] on calcination gives a black soil (S), carbon dioxide and water. (ii)[X]Dissolved in dil. HCl on reaction with KI gives a white precipitate(P) and iodine. (ii)[Y] on roasting gives metal (M) and a gas (`G_(1)`) which turns a acidified `K_(2)Cr_(2)O_(7)` solution green. (iv) [Y]on reaction with dil. HCl gives a whitw precipitat (Q) and another gas (`G_(2)`) which turns lead acetate solution black. and also reacts wiht gas `(G_(1))` to precipitate collodial suphur in presence of moisture. The M,S ,[X] and [Y] gives greenish blue flame. The metal ores [X] and [Y] are respectively:A. Carbonate and sulphide oresB. Sulphide and carbonate oresC. Carbonate and hydroxide oresD. Carbonate and oxide ores |
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Answer» Correct Answer - c |
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| 178. |
The method of zone refining of metals is based on the principle of :A. Greater mobility of the pure metal than that of impurityB. Higher melting point of the impurity than that of the pure metalC. Greater noble character of the solid metal than that of the impurityD. Greater solubility of the impurity in the molten state than in the solid |
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Answer» Correct Answer - 4 |
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| 179. |
In the extraction of copper, the slag formed in the blast furnace isA. `CaSiO_(3)`B. `FeSiO_(3)`C. `FeSiO_(3)`D. `MnSiO_(3)` |
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Answer» Correct Answer - B |
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| 180. |
Which of the following is the heavist metalA. UB. RaC. PbD. iron |
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Answer» Correct Answer - A |
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| 181. |
Which of the following options are correct?A. Cast iron is obtained by remelting pig iron scrap iron and coke using hot air blastB. In extraction of silver, silver is extracted as cationic complexC. Nickel is purifieed by zone refiningD. Zr and Ti are purified by Arkel method |
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Answer» Correct Answer - 1,4,16 |
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| 182. |
Electrochemical process (electrolysis of fused salt) is empolyed to extractA. IronB. MgC. NaD. Both Na and Mg |
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Answer» Correct Answer - D |
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| 183. |
Among the following statements, the incorrect one isA. cassiterite ore of tin contains the impurities of Wol-framite which are separted by electromagnetic separtor.B. tin metal is obtained by the carbone reduction of black tin.C. in the extraction of lead from galena, th roasting and self-reduction are carried out in the same furnance at different temperature.D. The copper obtained from Bessomer converter is called as blister copper. |
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Answer» Correct Answer - D |
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| 184. |
In which of the following method of purification metal is converted to its volatile compound which is decomposed to give pure metal?A. Heating with steam of carbon monoxideB. Heating with iodineC. LiquidationD. Distillation |
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Answer» Correct Answer - 1,2 |
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| 185. |
Which of the following statements are correct?A. a depressant prevents certain type of particle to come to the forthB. Copper matte contains `Cu_(2)S` and ZnS.C. The solidified copper obtained from reverberatory furnace has blisterd appearance due to evolution of `SO_(2)` during the processD. Zinc can be extracted by self-reduction |
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Answer» Correct Answer - 1,3 |
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| 186. |
The most suitable method for extraction of copper from low grade sulphide ore isA. Smelting processB. Hydrometallurgical processC. Leaching processD. Electrolytic process |
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Answer» Correct Answer - 2 |
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| 187. |
Which of the following reaction does not occur in Bessemer’s converter ?A. `2Cu_(2)S+5O_(2) rarr 2CuSO_(4)+2CuO`B. `2Cu_(2)S+3O_(2) rarr 2CuO+2SO_(2) uarr`C. `2CuFeS_(2)+O_(2) rarr Cu_(2)S+2FeS+SO_(2)`D. `FeO+SiO_(2) rarrFeSiO_(3)` |
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Answer» Correct Answer - 3 |
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| 188. |
Cost iron is prepared from haematite . In most of the Cases ore needs no concentration ,The ore is roasted to remove the volatile impurities ,During roasting the ,mass becomes porous Iron in the form of ferrous oxide os mixed with coke and heated in a blast furnace ,pig iron ios formed and is casted in the desired shape. the approximate wight percent of coke preesent in the charge of blast furnace isA. 10B. 20C. 30D. 40 |
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Answer» Correct Answer - c |
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| 189. |
Some statement about Ellingham diagram (a) Increase in the slope of the line on +ve side indicates the phase ransformation (b) Metal oxide decomposes on its own at the temperature when the `DeltaG^(0)` becomes positive (c ) Oxide of the upper line can reduced by the elements whose oxidation is represented by the lower line. The correct statement is/areA. Only aB. Only a and bC. Only b and cD. a,b and c |
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Answer» Correct Answer - D |
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| 190. |
In the process of extraction of gold. Roasted gold ore `+CN^(-)+H_(2)O overset(O_(2))rarr [X]+OH^(-)` `[X]+Znrarr [Y]+Au` Identify the complexes `[X] ` and `[Y]`.A. `[X]=[Au(CN)_(2)]^(-),[Y] =[Zn (CN_(4))]^(-2)`B. `[X]=[Au(CN)_(4)]^(-3),[Y] =[Zn (CN_(4))]^(-2)`C. `[X]=[Au(CN)_(2)]^(-3),[Y] =[Zn (CN_(6))]^(-4)`D. `[X]=[Au(CN)_(4)]^(-),[Y] =[Zn (CN_(4))]^(-2)` |
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Answer» Correct Answer - a |
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| 191. |
Which of the following is a sulphide ore?A. MagnetiteB. HaematiteC. CalamineD. Ironpyrites |
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Answer» Correct Answer - 4 |
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| 192. |
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 matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining. The chemical composition of the slag formed during smelting is.A. `CuSiO_(3)`B. `FeSiO_(3)`C. `CaSiO_(3)`D. `Cu_(2)O.SiO_(2)` |
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Answer» Correct Answer - b |
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| 193. |
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 matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining. Matte is a mixture ofA. `cu_(2)+FeS `(small amount )B. `FeS+Cu_(2)s`{small amount )C. `Cu_(2)O+FeO`(small amount)D. `Cu_(2)O +FeO`(large amount). |
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Answer» Correct Answer - a |
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| 194. |
Impurities in the zinc spelter areA. Ag and AuB. Cd and PdC. Cd and PbD. Cd,As and Au |
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Answer» Correct Answer - 3 |
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| 195. |
For how many metals of `10^(th)`12 th and `14^(th)` groups in periodic chart, Extraction is possible by self - reduction mrthod ? |
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Answer» Correct Answer - 3 |
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| 196. |
During the extraction of iron in the blast furnace ,A. Coke acts as reducing agent in the lower zone and CO acts as reducing agent in the upper zoneB. CO acts as reducing agent in the lower zone and Coke acts as reducing agent in the upper zoneC. Coke acts as reducing agent in the lower zone and CO acts as oxidising agent in the upper zoneD. CO acts as reducing agent in the upper zone and Coke acts as reducing agent in the upper zone |
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Answer» Correct Answer - a |
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| 197. |
Froth floatation :A. Froth carries the mineral particlesB. Froth carries gangue particlesC. Froth collectors enhance the non-wettability of the mineral particle with waterD. The mineral particles become wet by oils while gangue become wet by water. |
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Answer» Correct Answer - 2 |
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| 198. |
The substance used as froth stablisers in froth floatation process is :A. Fatty acidsB. AnilineC. pine oilD. Xanthates |
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Answer» Correct Answer - 2 |
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| 199. |
The collecting agent in froth floating process isA. Sodium ethyl xanthateB. `CuSO_(4)`C. LimeD. Water |
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Answer» Correct Answer - A |
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| 200. |
Which one of the following does not occurs as sulphide oreA. ZnB. CrC. AgD. Fe |
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Answer» Correct Answer - B |
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