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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.
| 401. |
The points noted by arrows are melting and boiling points of the metal zinc and magnasium. `Delta G^(0)` as a function of temperature for some reaction of extractive metallurgy. At what approximate temprature, zinc and carbon have equal affinity for oxygen?A. `1000^(@)`CB. `1500^(@)`CC. `500^(@)C`D. `1200^(@)C` |
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Answer» Correct Answer - b |
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| 402. |
Refining process of impure metals depends upon the differences in properties of the metal. Extraction of Al is usually carried out from its bauxite ore. Extraction of Iron is done by reduction of its oxide ore in blast furnance. Copper is extracted by smelting and heating in reverberatory furnance. Extraction of zinc from zinc oxide is done using coke. Several methods are used and employed in refining the metals The purification method used for mineral `Al_(2)O_(3).2H_(2)O`A. Froth floatationB. leachingC. liquationD. magnetic seperation |
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Answer» Correct Answer - a |
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| 403. |
Refining process of impure metals depends upon the differences in properties of the metal. Extraction of Al is usually carried out from its bauxite ore. Extraction of Iron is done by reduction of its oxide ore in blast furnance. Copper is extracted by smelting and heating in reverberatory furnance. Extraction of zinc from zinc oxide is done using coke. Several methods are used and employed in refining the metals Match list-I with List-II and select the correct answer using codes given below in the list `{:("List _I ","List-I"),("I. Cyanide process","(A) Ultra pure Ge"),("II. Froth Floatation process","(B) Pine oil"),("III. Electrolytic refining","(C) Extraction of Al"),("IV. Zone refining","(D) Extraction of Au"):}`A. I-C,II-A,III-D,IV-BB. I-D,II-B,III-C,IV-AC. I-C,II-B,III-D,IV-AD. I-D,II-A,III-C,IV-B |
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Answer» Correct Answer - b |
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| 404. |
Carnalite is present in sea water mainly. It is the main ore of magnesium which has the chemicakl fromula `MgCl_(2).KCl.xH_(2)O` . The value of x is . |
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Answer» Correct Answer - 6 |
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| 405. |
The most abundant ore of Al, called bauxite ore has the cheimal compositon `Al_(2)O_(3). xH_(2)O`. The x is |
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Answer» Correct Answer - 2 |
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| 406. |
Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO_(4).5H_(2)O)`, atacanite `[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, removal of iron and self-reduction. Iron is removed from chalcopyrite as. |
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Answer» Correct Answer - D |
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| 407. |
Which of the following is incorrectly matched? |
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Answer» Correct Answer - 2 |
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| 408. |
Select similarity between alkali metals and coinage metalsA. Both are required to store in organic solvenB. Both have high solubility in pure liquid ammonia to produce blue solutionC. Both can be extracted by aqueous salt elctrolysisD. Both have same number of electron(s) in outermost shell |
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Answer» Correct Answer - 4 |
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| 409. |
Go through the following graph and answer the following questions. Which of the following reaction is true?A. Reduction of calcined/roasted haematite ore to pig iron in blast furnance takes place in the lower temperature range and in the higher temperature range by CO and C respectivelyB. The reduction of zinc oxide using coke takes place at higher temperature than that in case of copperC. It is quite easyf to reduce oxide ores of copper directly to the metal by heating with coke after 500-600K.D. All of these |
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Answer» Correct Answer - b |
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| 410. |
Go through the following graph and answer the following questions. At what approximate temperature, zinc and carbon have equal affinity for oxygen.A. `1000^(@)`CB. `1500^(@)C`C. `500^(@)C`D. `1200^(@)C` |
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Answer» Correct Answer - a |
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| 411. |
Go through the following graph and answer the following questions. To make the following reduction process spontaneous, temprature should be : `ZnO+C rarr Zn+CO`A. `lt 1000^(@)C`B. `gt1000^(@)C`C. `lt 500^(@)C`D. `gt 500^(@)C " but " lt 1000^(@)C` |
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Answer» Correct Answer - a |
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| 412. |
Go through the following graph and answer the following questions. To make the following reduction process spontaneous, temprature should be : `ZnO+C rarr Zn+CO`A. `lt 1000^(@)C`B. `gt1000^(@)C`C. `lt 500^(@)C`D. `gt 500^(@)C " but " lt 1000^(@)C` |
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Answer» Correct Answer - a |
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| 413. |
Assertion : Nickel can be purified by Mond process. Reason : `Ni(CO)_(4)` is a volatile compound which deomposed at `460K` to give pure `Ni`. |
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Answer» Correct Answer - 1 |
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| 414. |
Statement -1:Aluminothermy is used for extraction of chromium from chromium oxide. Statement-2: Aluminium is reducing agent.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 - a |
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| 415. |
The weakest reducing agent among the following isA. Hydrogen gasB. CokeC. Carbon monoxide gasD. Aluminium metal |
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Answer» Correct Answer - A |
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| 416. |
The magnetic oxide of iron isA. HaemititeB. MagnetiteC. SideriteD. Limonite |
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Answer» Correct Answer - B |
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| 417. |
Bauxite is an oxide mineral o fA. BariumB. BoronC. BismuthD. Aluminium |
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Answer» Correct Answer - D |
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| 418. |
Which of the following mertal cannot occur in native state?A. CuB. ZnC. AgD. Fe |
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Answer» Correct Answer - B |
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| 419. |
Which of the following metal occurs in nativeA. CaB. AuC. ZnD. Al |
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Answer» Correct Answer - B |
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| 420. |
Which of the following reactions does not occur in Bessemer converter in the extraction of copper from chalcopyrites ?A. `2CuFeS_(2) + O_(2) rarr Cu_(2)S + 2FeS + SO_(2)`B. `FeO + SiO_(2) rarr FeSiO_(3)`C. `2FeS + 3O_(2) rarr 2FeO + 2SO_(2)`D. `Cu_(2)S + 2Cu_(2)O rarr 6Cu + SO_(2)` |
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Answer» Correct Answer - a |
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| 421. |
Statement-I : Thermite mixture `Fe_(2)O_(3) +Al` (powder) is used in the welding. Statement-II : Al is a good reductant. |
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Answer» Correct Answer - b |
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| 422. |
Speigel ( or spiegeleisen), used in the manufacture of steel by the Bassemer process, is an alloy ofA. iron, chroumium and carbonB. iron,nickel and carbonC. iron, tungsten and carbonD. iron, manganese and carbon |
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Answer» Correct Answer - 4 |
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| 423. |
Statement-I : `CuFeS_(2)` is concentrated by froath floatation method Statement-II : `CuFeS_(2)` is main ore of copper. |
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Answer» Correct Answer - b |
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| 424. |
In the commercial electrochemical process for aluminium extraction, the electrolyte used isA. `Al(OH)_(3)`in NaOH solutionB. An aqueous solution of `Al_(2)(SO_(4))_(3)`C. A molten mixture of `Al_(2)O_(3)and Na_(3)Alf_(6)`D. A molten mixture of AlO (OH) and `Al(OH)_(3)` |
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Answer» Correct Answer - c |
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| 425. |
In which of the following pair(s) the minerals are converted in to metals by self-reduction process?A. `Cu_(2)S, PbS`B. `PbS, HgS`C. `PbS, ZnS`D. `Ag_(2)S, Cu_(2)S` |
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Answer» Correct Answer - A::B |
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| 426. |
When the ore, haemattie in burnt in air with coke around `2000^(@)C` along with lime, the process not only produces steel but also produces a slag that is useful in making building materials. The slag isA. `Na SiO_(3)`B. `CaSiO_(3)`C. `SiO_(2)`D. `CaCO_(3)` |
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Answer» Correct Answer - B |
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| 427. |
When the ore haematite is burnt in air with coke around `2000 K` along with lime, the process not only produces steel but also produces a silicate slag that is useful in making building materials such as cement. Discuss the same and show through balanced chemical equation.A. `Na SiO_(3)`B. `CaSiO_(3)`C. `SiO_(2)`D. `CaCO_(3)` |
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Answer» Correct Answer - B |
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| 428. |
The reaction (s) which does (do) not occur in the reduction zone in the extraction of iron from haematite ore is (are)A. `Fe_(2)O_(3) rarr CO rarr 2FeO+CO_(2)`B. `FeO+CO rarr Fe +CO_(2)`C. `Fe_(2)O_(3) + 3C rarr 2Fe + 3CO`D. `CaO + SiO_(2) rarr CaSiO_(2)` |
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Answer» Correct Answer - C::D |
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| 429. |
The reaction (s) which does (do) not occur in the reduction zone in the extraction of iron from haematite ore is (are)A. `Fe_(2)O_(3) rarr CO rarr 2FeO+CO_(2)`B. `FeO+CO rarrn Fe +CO_(2)`C. `Fe_(2)O_(3) + 3C rarr 2Fe + 3CO`D. `CaO + SiO_(2) rarr CaSiO_(3)` |
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Answer» Correct Answer - C::D |
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| 430. |
Which of the following pairs of metals uis purified by van arkel method? |
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Answer» Correct Answer - 3 |
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| 431. |
The major role of flourspar, `CaF_(2)` which is added in small amount in the electrolytic reduction of `Al_(2)O_(3)` dissolved on fused cryolite in fused cryolite isA. As a catalystB. to make the fused mixture for reductionC. to lower the temperature of the melt.D. to decrease the rate of oxidation of carbon at the anode |
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Answer» Correct Answer - B::C |
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| 432. |
The major role of flourspar, `CaF_(2)` which is added in small amount in the electrolytic reduction of `Al_(2)O_(3)` dissolved on fused cryolite in fused cryolite isA. to acts as a catalystB. to make the fused mixture very conducting.C. to increase the temperature of the melt.D. to decrease the rate of oxidation of carbon at the anode |
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Answer» Correct Answer - B |
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| 433. |
(A) Led, tin and bismuth are purified by liquation method. (R ) Lead, tin and bismuth have low m.p. as compared to impuriites.A. If both (A) and (R ) are correct and (R ) is the correct explantion of (A )B. If both (A) and (R ) are correct and (R ) is not the correct explantion of (A )C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct |
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Answer» Correct Answer - A |
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| 434. |
The carbon-based reduction method is NOT used for the extraction ofA. Tin From `SnO_(2)`B. Iton from `Fe_(2)O_(3)`C. Aluminmum from `Al_(2)O_(3)`D. Mangnesium from `MgCO_(3).CaCO_(3)` |
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Answer» Correct Answer - c |
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| 435. |
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents areA. `O_(2)and CO`, EspectivelyB. `O_(2)and Zn ` Dust respectivelyC. `HNO_(3)andZN` dust respectivelyD. `HNO_(3) and CO` respectively |
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Answer» Correct Answer - b |
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| 436. |
Statement-I : Lead, tin and bismuth are purified by liquation method. Statement-II : Lead, tin and bismuth have low m.p as compared to impurities. |
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Answer» Correct Answer - c |
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| 437. |
Select the correct statementA. In the decomposition of an oxide into oxygen and gaseous metal, entropy increases.B. Decomposition of an oxide is an endothermic changeC. To make `DeltaG^(@)` negative , temperature should be high enough so that `T Delta S^(@) gt DeltaH^(@)`.D. All are correct statements. |
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Answer» Correct Answer - D |
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| 438. |
Which does not represent correct method?A. `TiCl_(2)+2Mg rarrTi+2MgCl_(2)` KrollB. `Ni(CO)_(4)rarrNi+4CO` :MondC. `Ag_(2)CO to 2Ag+CO_(2)+1/2O_(2)` : Van ArkelD. `ZrI_(4) rarrZr+2I_(2)` : Van Arkel |
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Answer» Correct Answer - C |
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| 439. |
Froth floatation process for the concentration of sulphide ore is an illustration of the practical application ofA. adsroptionB. absorptionC. sedimentationD. coagulateion |
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Answer» Correct Answer - 1 |
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| 440. |
Froth floatation process for the concentration of sulphide ore is an illustration of the practical application ofA. adsorptionB. absorptionC. sedimentationD. cogulation |
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Answer» Correct Answer - A |
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| 441. |
`NaCN` is sometimes added in the froth flotation process as a depressant when `ZnS` and `PbS` minerals are expected because `:`A. Pb `(CN)_(2)` is precipitated while there is no effect on ZnS.B. ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]` while PbS forms froth.C. PbS forms solumbe complex `Na_(2)[Pb(CN)_(4)]` while ZnS froms froth.D. Sillccious impurities settle down on the bottom. |
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Answer» Correct Answer - B |
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| 442. |
`NaCN` is sometimes added in the froth flotation process as a depressant when `ZnS` and `PbS` minerals are expected because `:`A. `Pb(CN)_(2)` is precipitated while no effect on ZnSB. ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]`C. PbS forms soluble complex `Na_(2)[Pb(CN)_(4)]`D. They cannot be separated by adding NaCN |
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Answer» Correct Answer - b |
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| 443. |
When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :A. `Pb(CN)_(2)` is precipitated while no effect on ZnSB. ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]`C. PbS forms soluble complex `Na_(2)[Pb(CN)_(4)]`D. They cannot be separated by adding NaCN |
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Answer» Correct Answer - a,b |
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| 444. |
Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air in a reverberatory furnace to obtain the oxide. (II) It is an exothermic process. (III) It is used for the concentration of sulphide ore. (Iv) It removes easily oxidisable volatile impurities present in the concentrated ore.A. I , II and IIIB. I ,II and IVC. I , III and IVD. I , II , III and IV |
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Answer» Correct Answer - b |
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