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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. |
In the following chemical reaction: `MO+C overset(Delta)to M+CO,` At what temperature this reaction is most feasible?A. `T_(3)`B. `T_(5)`C. `T_(6)`D. `T_(1)` |
| Answer» Correct Answer - a | |
| 152. |
Ore of a metal `M(X) to overset("roasting")to "Roasted ore" underset("absence of"O_(2))overset(Delta with (X)) to "Metal M"` Ore of metal `M(Y) to overset("calcination")to "Roasted ore" underset("absence of"O_(2))overset(Delta with (X)) to "Metal M"`A. X=chalcocite Y=malachiteB. X=Galena Y=CerussiteC. X-Zinc blende Y=CalamineD. a and b both are correct |
| Answer» Correct Answer - D | |
| 153. |
`Acl_(2)(excess)+BCl_(2) to Acl_(4)+Bdownarrow` `BO underset(gt400^(@)C)overset(Delta)to(1)/(2)O_(2)+B_(2)`. If A and B metal then ore of B would be:A. sideriteB. cinnabarC. malachiteD. horn silver |
| Answer» Correct Answer - B | |
| 154. |
Which of the following reaction is not involved in roasting?A. `2PbS+3O_(2) to 2PbO+2SO_(2)`B. `PbS+2O_(2) to Pb2SO_(4)`C. `4Fe_(3)O_(4)+5O_(2) to 2Cu_(2)O+4SO_(2)`D. `4CuS+5O_(2) to 2Cu_(2)O+4SO_(2)` |
| Answer» Correct Answer - C | |
| 155. |
Find the number of impurities which depostities as andode mud in the electrofining of copper. Antimony, Selenium, Tellurium, Silver, Gold, Platinum |
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Answer» Correct Answer - 6 Au,Ag,Sb,Te,Se,PT |
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| 156. |
Dolomite is an ore of:A. aluminiumB. magnesiumC. calciumD. potassium |
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Answer» Correct Answer - B,C `CaCO_(3).MgCO_(3)` |
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| 157. |
Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ors of copper include chalcanthite `(CuSO_(4).5H_(2)O)` , atacamite `(Cu_(2)Cl(OH)_(3))`, cuprite `(Cu_(2)O)`, copper glance `(Cu_(2)S)` and malachite `(Cu_(2)(OH)_(2)CO_(3))`. However , `80%` of the world copper production comes from the ore chalcopyrite `(CuFeS_(2))`. the extraction of copper from chalcopyrite involves partial roasting, removla of iron and self- reduction. Iron is removed from chalcopyrite asA. FeOB. FeSC. `Fe_(2)O_(3)`D. `FeSiO_(3)` |
| Answer» Correct Answer - d | |
| 158. |
Electromagneitc separation is used for:A. When ore is non-magnetic and impurity is magneticB. When ore is magnetic and impurity is non-magneticC. Both a and bD. None of these |
| Answer» Correct Answer - C | |
| 159. |
Select the correct staetment:A. Magnetite is an ore of maganeseB. Pyrolusite is an ore of leadC. Siderite is carbonate ore of ironD. `FeSO_(2)` is rolled gold |
| Answer» Correct Answer - C | |
| 160. |
Which of the following is used as a froth stabilizer?A. Pine oilB. `CuSO_(4)`C. `C_(2)H_(5)-O-underset(S)underset(||)(C)-S^(-)//Na^(+)`D. Aniline |
| Answer» Correct Answer - D | |
| 161. |
The process of isolation of metals by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is calledA. hydro metallurgyB. electrometallurgyC. zone reffingD. electrofinning |
| Answer» Correct Answer - A | |
| 162. |
High purity copper metal is obtained byA. carbon reductionB. hydrogen reductionC. electrolutic redcutionD. Thermite reduction |
| Answer» Correct Answer - C | |
| 163. |
High purity copper metal is obtained byA. carbon reductionB. hyrdrogen reductionC. electrolytic reductionD. Thermite reduction |
| Answer» Correct Answer - C | |
| 164. |
Assertion: In extraction of copper from chalcopyrite after roasting in supply of air ai moderate temperature, the temperature of the roasting ore is increased above the fusion temperature and then silica is added in reverberatory furnace. Reason: In the extraction of copper from chalcopyrites during smelting, the impurity of iron is removed as fusible slag `(FeSIO_(3))` in blast furnace or reverberatory furnace.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
| Answer» Correct Answer - D | |
| 165. |
During the electrolysis of fused carnalite, `MgCl_(2)`is decomposed to liberate Mg at cathode and not KCl to liberate the K at cathode. This is because of:A. lower decomposition voltage of `MgCl_(2)` than that of KClB. higher decomposition voltage of `MgCl_(2)` than that of KClC. higher melting point of `MgCl_(2)` than KClD. none of the above |
| Answer» Correct Answer - A | |
| 166. |
Which of the following minerals do/does not contain(s) copper?A. SideriteB. MalachiteC. LimoniteD. Anglestite |
| Answer» Correct Answer - A,C,D | |
| 167. |
Which of the following reactions is/are involved in the extraction of Cy from any ore of copper?A. `Cu_(2)O+C overset(Delta)to 2Cu+CO`B. `CuSO_(4)+Fe to Cu+SO_(2)`C. `2CuSO_(4)+Cu_(2)S to 6Cu+SO_(2)`D. All of the above |
| Answer» Correct Answer - D | |
| 168. |
Which of the following are the steps/reactions involved in the extraction of iron?A. `3Fe_(2)O_(3)+CO overset(Delta)to2Fe_(3)O_(4)+CO_(2)`B. `Fe_(2)O_(4)+CO overset(Delta)to 3FeOA+CO_(2)`C. `FeO+CO overset(Delta)to Fe+CO_(2)`D. Calcium silicate is prouduced as slag |
| Answer» Correct Answer - A,B,C,D | |
| 169. |
Statement-1: The reduction of a metal oxide is easier if the metal formed is in liquid state at he temperature of reduction. Statement-2: The value of entropy change `DeltaS` of the reduction process is more on +ve side when the metal formed is in liquid state and the metal oxide being reduced in a solid state. Thus, the value of the `DeltaG` becomes more or negative side.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
| Answer» Correct Answer - A | |
| 170. |
The metal which mainluy occurs as oxide ore in nature is:A. goldB. leadC. aluminiumD. magnesium |
| Answer» Correct Answer - B,C | |
| 171. |
In order to concentrate galena (which contains ZnS as impurity) by froth floatation process, sodium cyanide is used as department. NaCN dissolves ZnS due to formation of water soluble complex (A). Find wxyz, Where w=corrdination number of central metal ion in complex ion of (A) x=number of unpaired electrons in (A) y=total number of possible linkage isomers of (A) including (A) z=maximum number of atoms in a single plane in the complex ion of (A). |
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Answer» Correct Answer - 4055 `A to Na _(2)underset(sp^(3))[Zn(CN)_(4)],w=4,x=0,y=5,z=5` |
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| 172. |
Hydraulic washing/gravity separation can be used to concentrate:A. Ore of NaB. Ore of KC. CarmaliteD. Ore of Fe |
| Answer» Correct Answer - D | |
| 173. |
Aluminium is extracted in the electrolysis of :A. aluminaB. bauxiteC. moleten cryoliteD. aluminia mixed with molten cryolite |
| Answer» Correct Answer - D | |
| 174. |
Leaching is a process ofA. reductionB. concentrationC. refiningD. oxidation |
| Answer» Correct Answer - B | |
| 175. |
Carbon reduction is not possible for the oxide of alkaline earth metals because:A. of formation of carbides at high temperaturesB. high temperature is not required for reductionC. carbon reduction is not possible for any alkaline earth metals except BeD. None of these |
| Answer» Correct Answer - A | |
| 176. |
Froth floatation process isused to concentrate:A. sulphide oresB. oxide oresC. halide oresD. elemental ores |
| Answer» Correct Answer - A | |
| 177. |
Calcination cannot be done In case ofA. `ZnCO_(3)`B. `CuCO_(3).Cu(OH_(2)`C. PbSD. `2Fe_(2)O_(3).3H_(2)O` |
| Answer» Correct Answer - C | |
| 178. |
In metallurgy process, the flux used for removing acidic impurities is:A. silicaB. sodium chlorideC. lime stoneD. sodium carbonate |
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Answer» Correct Answer - C Limestone,`CaCO_(3)` is basic |
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| 179. |
Which of the following statemetnt is not correct for leaching?A. Ore shoule be soluble in a suitable solventB. It is done for low grade ores.C. Leaching of `Al_(2)O_(3)` from bauxite is based on amphoteric nature of bauxite.D. None of these |
| Answer» Correct Answer - D | |
| 180. |
Ellingham diagram represents:A. change of `DeltaG` with temperatureB. change of `DeltaH` with temperatureC. change of `DeltaG` with pressureD. change of `(DeltaG-TDeltaS)` with temperature |
| Answer» Correct Answer - A | |
| 181. |
On the basis of Ellingham diagram which of the following is/are correct?A. Entropy change for all metal oxides is roughly same.B. Below the boiling point,` TDeltaS` factor is same irrespective of metal.C. Above `DeltaG=0` line, oxide decomposes into metal and oxygen.D. If randomness increases the slope increases. |
| Answer» Correct Answer - B,C,D | |
| 182. |
Ellingham diagram can be drawn for the following:A. SulphidesB. OxidesC. HalidesD. All of these |
| Answer» Correct Answer - D | |
| 183. |
Consider the following reaction at `1000^(@)C` `(A) Zn_((s))+(1)/(2)O_(2(s))+ZnO_(s),DeltaG^(0)=-360kJ"mole"^(-1)` (B) `(B) Cn_((s))+(1)/(2)O_(2(g))to CO_(s),DeltaG^(0)=-460kJ"mole"^(-1)` choose the correct statement at `1000^(0)C`A. Zinc can be oxidised by COB. Zinc oxide can be reduced by CC. Both satement (a) and (b) are trueD. Both statement (a) and (b) are false |
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Answer» Correct Answer - B `ZnO+C to Zn+CO,` `" " Delta_(Rx^(n))^(@)=-460+360 lt 0 ("Spontaneous")` |
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| 184. |
The standard free energy of formation of MgO AND CO at temperature `1000^(@)C and 2000^(@)C` are given below (they refer to the reaction involving one mole of oxygen at one atomsphere pressure) The free energy change to the reaction. `2Mg+O_(2) to 2MgO " " DeltaG_(1000^(@)C)=-941kJ//mol` `" "DeltaG_(2000^(@)C)=-341kJ//mol` `2C+O_(2) to 2CO " " DeltaG_(1000^(@)C)=-439kJ//mol` `" "DeltaG_(2000^(@)C)=-628kJ//mol`A. At `1000^(@)C` temperatureB. At `2000^(@)C` temperatureC. Both a and bD. None of these |
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Answer» Correct Answer - B `2MgO+2C to 2Mg+CO` `" " DeltaG_("Reaction")=DeltaG_(CO)-DeltaG_(MgO)` `At 1000^(@)C,DeltaG=-439+941 gt 0("Non-spontaneous")` `At 2000^(@)C,DeltaG=-439+941 gt 0("spontaneous")` |
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| 185. |
Which one set of minerals is best suited for roasting?A. `AlO_(x)(OH)_(3-2x),FeS_(2),CuFeS_(2),ZnS`B. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O,CuCO_(3).Cu(OH)_(2),Cu_(2)S,PbS,Fe_(2)O_(3)`C. `CuFeS_(2),HgS,ZnS,PbS,Fe_(2)O_(3)`D. `AgCl,Al_(2)(OH)_(4)Si_(2)O_(5),Cr_(2)O_(3),ZnO` |
| Answer» Correct Answer - C | |
| 186. |
Statement-1:Magnesia and quick lime are used as basic flux. Statement-2:MgO and CaO can withstand very high temperatures.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
| Answer» Correct Answer - B | |
| 187. |
Assertion: Silica is added as a flux in reverberatory furnace, in the extrcation of copper from copper phyrites. Reason: Silica decreases the melting point of the ore and increases the conductivity.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
| Answer» Correct Answer - C | |
| 188. |
During extraction of iron from haematite, the flux used is _______.A. silicaB. it liberates oxygen on heatingC. lime stoneD. coke |
| Answer» Correct Answer - C | |
| 189. |
Desilverisation process is used for:A. CuB. PbC. Sn and CuD. Fe |
| Answer» Correct Answer - B | |
| 190. |
Which of the following option is incorrectA. `Fe_(2)O_(3)` can be reduce by coke as well as aluminium.B. Red bauxite is concentrate by leaching method.C. Impure Zn is purified by either distilation or electrolytic refining methodD. Pig rion is a purest form of iron. |
| Answer» Correct Answer - D | |
| 191. |
Which is incorrect for function of flux?A. Lowers down the temperature of melting of oreB. Remove gangueC. Remove particlesD. As solvent |
| Answer» Correct Answer - D | |
| 192. |
Which of the following option is incorrectA. B is purified by Van Arkel method because `BI_(3)` is volatile iodile.B. Si and Ge are purified by Zone refining method.C. Chemical reaction:`Fe_(2)O_(3)+Al to Al_(2)O_(3)+Fe` ("its an endothermic process)D. The affinity of `Cu^(2+)` towards `S^(-2)` is more than `O^(-2)` |
| Answer» Correct Answer - C | |
| 193. |
Which of the following statement(s) is/are true for the extraction of tin form ore cassiteriteA. Impurity of wolframite is remvoed by magnetic separation.B. The concentrated ore containing 60-70% `SnO_(2)` is called as black tin.C. Tin is obtained by the carbon reduction of `SnO_(2)`D. Angiesite is an another ore of tin. |
| Answer» Correct Answer - A,B,C | |
| 194. |
Tin and zinc can be refined by:A. CupellationB. liquationC. polingD. bessemerisation |
| Answer» Correct Answer - B | |
| 195. |
Copper and tin are refined by:A. liquaitonB. cupellationC. bessermerisationD. poling |
| Answer» Correct Answer - D | |
| 196. |
In Poling process of purification of `Cu, O_(2)` oxidises following group of elements.A. S,Sb,AsB. Sb,As,FeC. S,Sb,AsD. As,Ag,Au |
| Answer» Correct Answer - A,B,C | |
| 197. |
When an impurity in a metal has greater affinity for oxygen and is more easily oxidises then the metal itself. Then, the metal is refined byA. CupellationB. zone refiningC. distillationD. electrolytic process |
| Answer» Correct Answer - A | |
| 198. |
Which of the following reactions are example of termite reduction?A. A thermic reaction may start if a ship having Al parts is hit by a missbleB. `Al_(2)O_(3)+3Mg overset(Delta)to 3MgO+2Al`C. `Fe_(2)O_(3)+2Al overset(Delta)to 2Fe+Al_(2)O_(3)`D. `Cr_(2)O_(3)+Al overset(Delta)to 2Cr+Al_(2)O_(3` |
| Answer» Correct Answer - A,C,D | |
| 199. |
Electrolysis is used commercially to isolate which metas(s): (P) (Q) FeA. P onlyB. Q onlyC. both P and QD. Neither P nor Q |
| Answer» Correct Answer - A | |
| 200. |
A mixture containing chlorides of sodium, calcium and zinc is electrolysed in presence of water. The product obtianed at cathode will be:A. NaB. `H_(2)`C. CaD. Zn |
| Answer» Correct Answer - B | |