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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.
| 51. |
Identify the metal M whose extraction is bsed on the following reaction: `MS+2O_(2) to MSO_(4)` `2MS+3O_(2) to 2MO+2SO_(2)` `MS+2MO to 3M+SO_(2)` `MS+MSO_(4) to 2M+2SO_(2)`A. magnesiumB. aluminiumC. leadD. tin |
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Answer» Correct Answer - C Process mentioned in the question is self redcution. Leadis extracted by this method. |
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| 52. |
Blister copper is:A. impure copperB. obtained in self reduction process during bessemerisationC. both a and b are correctD. None of these |
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Answer» Correct Answer - C The solidified copper obtained after bessermerisation is impure and contains Fe,Ni,Zn,Ag,Au,etc. as impurity. It has blistered like appearance due to the evolution of `SO_(2)` and so it is called blister copper. |
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| 53. |
Which of the following statement is correct regarding `Cu` extraction ?A. In the smelting step, carbon reduction takes placeB. During partical roasting, `Cu_(2)S` remain almost unaffectedC. In Bessemer converter, only self reduction occur, not slag formationD. Blister formed in the blister of Cu is due to dissolved of `CO_(2)` |
| Answer» Correct Answer - B | |
| 54. |
Blister Cu is aboutA. 60% CuB. 90% CuC. 98% CuD. 100% Cu |
| Answer» Correct Answer - C | |
| 55. |
Silica is added to raosted copper during extraction in order to remove:A. Cuprous sulphideB. ferrous oxideC. ferrous sulphideD. curprous oxide |
| Answer» Correct Answer - B | |
| 56. |
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 slagC. It convers lead silicate to lead oxideD. It remove the impurity of iron oxide as fusible |
| Answer» Correct Answer - A,B,C | |
| 57. |
Select the correct statement.A. Group I and group II elements are generally extracted by the elctrolysis of aqueous solution of their chlorides.B. Irona is extracted by aluminio-thermic process.C. Calcination and roasting involve heating of concentrated ores above their fusion temperatureD. Lead can be extracted by carbon reduction as welll as self reduction method. |
| Answer» Correct Answer - D | |
| 58. |
Which of the following is not an ore of iron?A. MagnetiteB. HaematiteC. SideriteD. Chalcopyrite |
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Answer» Correct Answer - D `CuFeS_(2)` althought contains Fe, but Fe cannot be profitably extracted from it |
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| 59. |
Silver ore dissolve in the dilute solution of NaCN in the presence of air to form:A. AgCNB. `[Ag(CN)_(2)]^(-)`C. AgCNOD. `[Ag(CN)_(3)]^(3-)` |
| Answer» Correct Answer - B | |
| 60. |
`"Elemeta ore" underset((ii)"Filter")overset("Alkaline NaCN solution+air")to underset("Filtrate")(X)` `(X) overset("Metal powder")to (Y)downarrow + underset("soluble complex")(Z)` Which of the following elements is extracted by the above mentioned method?A. AlB. AgC. ZnD. Pb |
| Answer» Correct Answer - b | |
| 61. |
Among the following statements, the incorrect one isA. calamine and siderite are carbonateB. argentite and curprite are oxideC. zinc blende and pyrites are sulphideD. malachite and azrites are ores of copper |
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Answer» Correct Answer - B `"Argentite" to Ag_(2)S` |
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| 62. |
`"Elemeta ore" underset((ii)"Filter")overset("Alkaline NaCN solution+air")to underset("Filtrate")(X)` `(X) overset("Metal powder")to (Y)downarrow + underset("soluble complex")(Z)` Which of the following can be used to precipitate (Y) from the filtrate (X)?A. Zn dustB. Al dustC. Pt dustD. Both a and b |
| Answer» Correct Answer - d | |
| 63. |
Find the incorrect matchA. Azuite:`CuCO_(3).2Cu(OH)_(2)`B. Malachite:`Cu(OH)_(2).CuCO_(3)`C. Anglesite: `PbSO_(4)`D. Chalcocite:`Cu_(2)S` |
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Answer» Correct Answer - A `"Azurite" Rightarrow 2CuCO_(3).Cu(OH)_(2)` |
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| 64. |
Which of the following does not contain Mg?A. MagnetiteB. MagnesiteC. AsbestosD. Carnallite |
| Answer» Correct Answer - A | |
| 65. |
Question given below are based on the given diagram of extractive metallurgy. The point noted by arrow are the melting and boiling points of the metals zinc and magnesium. `DeltaG^(@)` as a function of temperature for some reaction of extractive metallurgy. At this temperature `DeltaG^(@)` of the reaction is: `ZnO+C to Zn+CO`A. `-ve`B. `+ve`C. zeroD. nothing can be said |
| Answer» Correct Answer - c | |
| 66. |
Question given below are based on the given diagram of extractive metallurgy. The point noted by arrow are the melting and boiling points of the metals zinc and magnesium. `DeltaG^(@)` as a function of temperature for some reaction of extractive metallurgy. At what temperature, zinc and carbon have equal affinity for oxygen?A. `1000^(@)C`B. `1500^(@)C`C. `500^(@)C`D. `1200^(@)C` |
| Answer» Correct Answer - a | |
| 67. |
Which of the following statements are not correct?A. Copper is extracted by self reduction method.B. Cast iron is the purest form of iron.C. The concentra of malachite ore is `Cu(OH)_(2).2CuCO_(3)D. Cupellation process is used for the refining of Ag and Au. |
| Answer» Correct Answer - B,C | |
| 68. |
The substance not likely to contain `CaCO_(3)` isA. sea shellsB. dolomiteC. marble statueD. calcined gypsum |
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Answer» Correct Answer - D Calcined gypsum `Rightarrow CaSO_(4)` |
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| 69. |
Which of the following step of metallurgy requires oxygen?A. Calcination of dolomiteB. Roasting of cinnabarC. Zone of refining of SiD. Leaching of gold by NaCN solution |
| Answer» Correct Answer - B,D | |
| 70. |
Collectors are the subsances which help in attachment of an ore particle to air bubble in froth. A popular collector used industrically is:A. sodium ethyl xantheB. sodium xenateC. sodium prophosphateD. sodium nitroprusside |
| Answer» Correct Answer - A | |
| 71. |
which of the following reactions represents a calcinaiton reaction?A. `HgS+O_(2) to Hg+SO_(2)`B. `AgNO_(3)+NaCl to AgCl+NaNO_(3)`C. `CuCO_(3).Cu(OH)_(2) to CuO+CO_(2)+H_(2)O`D. `Al_(2)O_(3)+NaOH to NaAlO_(2)+H_(2)O` |
| Answer» Correct Answer - C | |
| 72. |
A non magnetic ore contaning the impurity of `FeCr_(2)O_(4)` is concentrated by:A. magnetic separationB. gravity separationC. froth floatation methodD. electrostatic method |
| Answer» Correct Answer - A | |
| 73. |
Sometimes, it is possible to separate two sulphide ores by adjusting proportion of oil to water or by using depressants. In case of an ore containing ZnS and PbS, the depresent used isA. `CuSO_(4)`B. NaCNC. `Na_(2)S`D. None of these |
| Answer» Correct Answer - B | |
| 74. |
Which of the following ore do not contain iron (do not consider any impurity in ore)?A. PyrolusiteB. MagnetiteC. ChromiteD. Casseterite |
| Answer» Correct Answer - A,D | |
| 75. |
Select the ore in which corresponding metal is represent to highest ooxidation state among the given ores.A. Copper pyritesB. ZinciteC. haematiteD. Pyrolusite |
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Answer» Correct Answer - D `overset(+)(Mn)O_(2)` |
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| 76. |
Which form of iron has highest carbon content?A. SteelB. Pig ironC. Cast ironD. Wrought iron |
| Answer» Correct Answer - B | |
| 77. |
Which of the following conversion is correct for indicated process?A. `PbSO_(4) to PbO+SO_(2)+(1)/(2) ("roasting")`B. `PbSO_(4)+PbS to Pb+SO_(2)+ ("self reduction")`C. `2Na[Ag(CN)_(2)]+Zn to Na_(2)[Zn(CN)_(3)]+2Ag ("leaching")`D. `CuSO_(4)(aq.)+2Ag to underset("metal displacement method")(Ag_(2)SO_(4)(aq)+Cu)` |
| Answer» Correct Answer - B | |
| 78. |
Which of the following statement is correct?A. `CuCO_(3).Cu(OH)_(2)` is concentrated by froth floatiation method using NaCNB. Calcination, roasting both are only thermalC. In reverberatory furnace when ore is heated with excess `O_(2)` is called calcinationD. Commercial extraction of Ti is done by thermite process |
| Answer» Correct Answer - D | |
| 79. |
Which of the following reaction is not involved in thermite process?A. `2Mn_(3)O_(4)+8Al to 9Mn+4Al_(2)O_(3)`B. `Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr`C. `2Fe+Al_(2)O_(3) to 2Al+Fe_(2)O_(3)`D. `B_(2)O_(3)+2Al to 2B+Al_(2)O_(3)` |
| Answer» Correct Answer - C | |
| 80. |
In Goldschmidt aluminothermic process, thermite mixture contains:A. `3 parts Fe_(2)O_(3) and 2partsAl`B. `3 parts Al_(2)O_(3) and 2 parts Al`C. `1 parts Fe_(2)O_(3) and 12 parts Al`D. `3 parts Fe_(2)O_(3) and 1 parts Al` |
| Answer» Correct Answer - D | |
| 81. |
(viii) Amongest the following groups of oxides, the group containing oxides that cannot be reducing by carbon to give the respective metals is.A. `CaO and K_(2)O`B. `Fe_(2)O_(3), ZnO`C. `Cu_(2)O and SnO_(2)`D. `PbO, and Pb_(3)O_(4)` |
| Answer» Correct Answer - A | |
| 82. |
(viii) Amongest the following groups of oxides, the group containing oxides that cannot be reducing by carbon to give the respective metals is.A. `Cu_(2)O, SnO_(2)`B. `Fe_(2)O_(3), ZnO`C. `CuO,K_(2)O`D. `PbO, FeO` |
| Answer» Correct Answer - C | |
| 83. |
Magnetic separation process may be used for the concentration of:A. ChalcopyriteB. bauxiteC. haematiteD. calamine |
| Answer» Correct Answer - C | |
| 84. |
The formula of carnallite isA. `LiAl (Si_(2)O_(5))_(2)`B. `KCl.MgCl_(2).6H_(2)O`C. `K_(2)O.Al_(2)O_(3).6SiO_(2)`D. `KCl.MgCl_(2).2H_(2)O` |
| Answer» Correct Answer - B | |
| 85. |
Dolomite is mineral whose formula is:A. `CaMg(CO_(3))_(2)`B. `MgCO_(3)`C. `CaCO_(3).MgCO_(3)`D. a and c both |
| Answer» Correct Answer - D | |
| 86. |
The metal that occurs in the nativ estae as well as in the combined form isA. silverB. magnesiumC. aluminiumD. manganese |
| Answer» Correct Answer - A | |
| 87. |
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. In self- reduction, the reducing species isA. SB. `O^(2-)`C. `S^(2-)`D. `SO_(2)` |
| Answer» Correct Answer - c | |
| 88. |
The ore in which sulphide is absent.A. cupriteB. Argentite is an oxide ore of silverC. pyritesD. siderite |
| Answer» Correct Answer - A,D | |
| 89. |
Which one of the following is not true in elctrolytic refining?A. Cathode is made up of impure metalB. Anode is made up impure metalC. Cathode is of impure metal and anode is of pure metalD. Both electrodes must be of pure metal |
| Answer» Correct Answer - A,C,D | |
| 90. |
The chemical treatment of the ore for concentration is done in the case of :A. aluminiumB. silverC. copperD. gold |
| Answer» Correct Answer - A,B,D | |
| 91. |
Egg shell is made up of a chemica. IN which of the following ore this chemical is present?A. dolomiteB. CalamineC. lime stoneD. Feldspar |
| Answer» Correct Answer - A,C | |
| 92. |
Which of the following option are correct?A. Wrought iron is a purest form of iron.B. `Ca_(3)(PO_(4))_(2)O` is called Thomas slag, used as a fertilizer.C. In a puddling process, `Fe_(2)O_(3)` act as a oxidising agent.D. `FeSiO_(3)` slag is formed during the extraction of Cu. |
| Answer» Correct Answer - A,C,D | |
| 93. |
For this graph which option is correct? A. At less than `1500^(@)C`, Mg acts as reducing agent for `SiO_(2)`B. At more than `1500^(@)C`, Si acts as reducing agaent for MgOC. Both a and bD. None of these |
| Answer» Correct Answer - C | |
| 94. |
In the following chemical reaction: `MO+C overset(Delta)to M+CO uparrow` `DeltaG` overall of the reaction is zero at what temperatureA. `1800^(@)C`B. More than `1800^(@)C`C. Less then`1800^(@)C`D. None of these |
| Answer» Correct Answer - A | |
| 95. |
Sulphide ores are generally concentrated by the `:`A. gravity separation processB. calcination processC. leaching processD. None of these |
| Answer» Correct Answer - D | |
| 96. |
Ore dressing for iron is done byA. froth floatation methodB. magnetic separationC. hand pickingD. all of the above |
| Answer» Correct Answer - B | |
| 97. |
Which of the following metal is NOT purified by Van Arkel methodA. TiB. ZrC. NiD. Hf |
| Answer» Correct Answer - C | |
| 98. |
Softening of lead meansA. melting pure lead at high temperatureB. removal of impurities, except silver, present in commercial lead.C. formation on of lead alloyD. formation of 100% pure lead |
| Answer» Correct Answer - B | |
| 99. |
During the production of iron and steel.A. The oxide ore is primarily reduced to iron by solid coke according to the reaction: `2Fe_(2)O_(3)+3C to 4Fe+3CO_(2)`B. The oxide ore is reduced by the carbon monoxide according to the reaction `Fe_(2)O_(3)+3CO to 2Fe+3CO_(2)`C. Major silica impurities are removed as calcium silicate slag by addition of a fluxing agent lime stone.D. The converter slag containing phosphorus is used as fertilizer. |
| Answer» Correct Answer - B,C,D | |
| 100. |
Which of the following steel treatement process is applicable for softening of the steel?A. LeachingB. QuenchingC. NitridingD. Annealing |
| Answer» Correct Answer - D | |