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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. |
Which of the following metals is not extracted by leaching ?A. AluminiumB. MercuryC. SilverD. Gold |
| Answer» Correct Answer - B | |
| 52. |
Alkali metals can be extracted form their salts byA. reduction with carbonB. electrolysis of their fused halidesC. electrolysis of aqueous solution of their halidesD. reduction with aluminium. |
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Answer» Correct Answer - (B) |
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| 53. |
On Ellingham diagrams if two graphs intersect each other, what does the point of intersection indicate ? |
| Answer» The point of intersection of two lines of the Ellingham diagram indicates `DeltaG^(@)` value to be zero. | |
| 54. |
Copper pyrites are concentrated byA. Froth floatation processB. Gravity seperationC. DistillationD. Fractionation. |
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Answer» Correct Answer - A copper pyrites a sulphide of copper is concentrated by froth floatation method. |
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| 55. |
Iron pyrites is generally roasted to obtain `Fe_(3)O_(4)` first. `Fe-(3)O_(4)` can be concentrated byA. gravity seperationB. froth floatationC. leachingD. magnetic seperation. |
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Answer» Correct Answer - D |
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| 56. |
Pick up the correct statementA. All ores are mineralsB. All minerals are oresC. A mineral cannot be oreD. An ore cannot be a mineral |
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Answer» Correct Answer - A All ores are minerals but all minerals are not ores. |
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| 57. |
Gold can easily dissolve inA. conc.`HNO_3`B. conc.HClC. KCN(aq) + `O_(2)`D. None of these. |
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Answer» Correct Answer - C |
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| 58. |
Pick out the correct statementA. Inner core of the earth is made up of almost pure solid ironB. Inner core of the earth is made up of almost pure molten ironC. Inner core of the earth is made up of molten rockD. Inner core of the earth is made up of solid rock. |
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Answer» Correct Answer - A |
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| 59. |
Which method is used for purification of Bauxite ore ?A. LevigationB. LeachingC. ElectrolysisD. Magnetic seperation |
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Answer» Correct Answer - B Leaching is done to purify the Bauxite an ore of Aluminium. |
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| 60. |
An ore of tin containing `FeCrO_(4)` is concentrated by _____.A. Magnetic seperationB. Froth floatationC. Electrostatic methodD. Gravity seperation |
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Answer» Correct Answer - A An ore of tin containing `FeCrO_(4)` is concentrated by magnetic seperation as `FeCrCO_4` is ferromagnetic in nature. |
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| 61. |
Slag is a product of:A. flux and cokeB. coke and metal oxideC. flux and impuritiesD. metal and flux. |
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Answer» Correct Answer - C Flux + Impurity = Slag |
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| 62. |
Smelling is usually carried out inA. Blast furnaceB. Open hearth furnaceC. Muffle furnaceD. Electric furnace. |
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Answer» Correct Answer - A Smelting is carried out in blast furnace. |
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| 63. |
The most common method of extraction of metals from oxide ores involveA. Reduction with carbonB. Electrolytic methodC. Reduction with aluminiumD. Reduction with hydrogen |
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Answer» Correct Answer - A Redcution with carbon (smelting) For example `Fe_(2)O_3` + 3C `rarr` 2Fe + 3CO |
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| 64. |
Refractory materials are generally used in furnaces becauseA. they can withstand high temperatureB. they are chemically insertC. their melting point is highD. None of these |
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Answer» Correct Answer - A Refractory metals are used in construction of furnaces because they can withstand high temperature. |
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| 65. |
Assertion : Gold and silver are extracted from their native ores by leaching. Reason : Both silver and gold particles dissolve in dilute solution of sodium cyanide in presence of oxygen.A. If both assertion and reason are true and reason is the correct explanation of assertion .B. if both assertion and reason are true but reason is not the correct explanation of assertionC. If assertion is true but reason is falseD. If both assertion and reason are false. |
| Answer» Correct Answer - A | |
| 66. |
Which step is not involved in hydrometallurgical process ?A. `CuFeS_(2) + 2H_(2)SO_(4) to CuSO_(4) + FeSO_(4) + 2H_(2)S`B. `CuCO_(3) + H_(2)SO_(4) to CuSO_(4) + CO_(2) + H_(2)O`C. `CuSO_(4) +2Cu_(2)O to 6Cu+SO_(2)`D. `Cu_(2)+2Cu_(2)O to 6Cu+SO_(2)` |
| Answer» Correct Answer - D | |
| 67. |
Elecyroltic refining is used to purify which of the following metals?A. Cu and ZnB. Ge and SiC. Zr and TiD. Zn and Hg |
| Answer» Correct Answer - A | |
| 68. |
Zone refining is a method to obtainA. very high temperatureB. Ultra pure AlC. Ultra pure GermaniumD. Ultra pure oxide |
| Answer» Correct Answer - C | |
| 69. |
Which method is not correct for refining of crude metals ?A. Zone refining : SiliconB. Mond process: AluminiumC. Electrolytic refining : Blister copperD. Liquation : Tin |
| Answer» Correct Answer - B | |
| 70. |
Vapour phase refining of nickel is carried out usingA. `I_2`B. `Cl_2`C. HClD. CO |
| Answer» Correct Answer - D | |
| 71. |
Concentration of pentladite is carried out by usingA. gravity processB. froth floatation processC. electromagnetic processD. Any of these. |
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Answer» Correct Answer - B |
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| 72. |
Name the metal which is used for galvanising iron. |
| Answer» Zinc is used for galvansation of iron. | |
| 73. |
Which of the following alloy contains four components ?A. Nickel steelB. Chrome steelC. AlnicoD. Invar |
| Answer» Correct Answer - C | |
| 74. |
Brass consist of __________ percent of copper .A. 30B. 40C. 60D. 80 |
| Answer» Correct Answer - C | |
| 75. |
Pulverisation is __________ .A. a process of breaking big pumps into small lumpsB. a process of concentration of oresC. ore dressingD. a process of fine powdering ores |
| Answer» Correct Answer - D | |
| 76. |
The metal found in sediments in ocean floor isA. AgB. MgC. MnD. Pt. |
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Answer» Correct Answer - C |
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| 77. |
The important oxide ore of iron isA. SidheriteB. HaematiteC. PyritesD. Bauxite |
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Answer» Correct Answer - B Haematite is an important oxide ore of iron . |
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| 78. |
The metal extracted by cyanide process isA. SilverB. CopperC. IronD. Sodium Aluminium . |
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Answer» Correct Answer - A The metal obtained by cyanide process is Ag. |
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| 79. |
Which chemical is most commonly used as collector in froth floatation process ? |
| Answer» Potassium ethyl xanthate, `C_(2)H_(5)-O-overset(S)overset(||)(C )-S^(-)K^(oplus)` | |
| 80. |
Which of the following is used in thermine welding ?A. `TiO_2` + 4Na `rArr` Ti + `2Na_(2)O`B. 2Al + `Fe_(2)O_3` `rArr` `Al_(2)O_3` + 2FeC. `SnO_2` + 2C `rArr` Sn + 2COD. `Cr_(2)O_3 + 2Al to Al_(2)O_(3) + 2Cr` |
| Answer» Correct Answer - B | |
| 81. |
Which of the following methods is used for obtaining Aluminium metal ?A. Electrolysis of food `Al_(2)O_3` and cryoliteB. By heating alumina with carbonC. By heating alumina in Muffle furnaceD. By a process called pyrometallurgy |
| Answer» Correct Answer - A | |
| 82. |
According to Ellinigliam diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following oxides at the lowest tempertaureA. `Al_(2)O_3`B. `Cu_(2)O`C. MgOD. ZnO |
| Answer» Correct Answer - B | |
| 83. |
Which of the following oxides is/are amphoteric ?A. `Na_(2)O`B. CaOC. `Al_(2)O_3`D. `SnO_2` |
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Answer» Correct Answer - C::D `Al_(2)O_(3)` and `SnO_2` are amphoteric in nature . |
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| 84. |
Which one of the following ores is treated by chemical leachingA. GalenaB. Copper pyriteC. Copper glance.D. Argentite |
| Answer» Correct Answer - D | |
| 85. |
Identify the reaction that does not take place in a blast furnaceA. `2Fe_(2)O_3` + 3C `rArr` 4Fe + `CO_2`B. `CO_2` + C `rarr` 2COC. `CaCO_3` `rarr` CaO + `CO_2`D. FeO + `SiO_2` `rarr` `FeSiO_3` |
| Answer» Correct Answer - D | |
| 86. |
Which metal has a greater tendency to form metal oxideA. AlB. CaC. CrD. Fe |
| Answer» Correct Answer - B | |
| 87. |
Calcination is the process of heating the oreA. the presence of nitrogenB. the absence of airC. the presence of airD. the presence of calciumcarbonate |
| Answer» Correct Answer - B | |
| 88. |
Heating an ore in the absence of air below its melting point is calledA. LeachingB. RoastingC. SmeltingD. Calcination |
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Answer» Correct Answer - D Heating an ore in the absence of air below its melting point is called calcination. |
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| 89. |
Discuss the process of roasting with suitable example. |
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Answer» Sulphide ores are generally roasted in reverberatory furnace in free supply of air below melting point. Ore changes to oxide with larger surface area and volatile impurties are removed. `2ZnS+3O_(2)overset(Delta)(to)2ZnO+2SO_(2)` `2PbS+3O_(2)overset(Delta)(to)2PbO+2SO_(2)` |
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| 90. |
During roasting the temperature should be kept below its m.p. Why ? |
| Answer» If the temperature is raised above `m.p.` of the ore, it will get mixed with volatile impurties and may vapourise. | |
| 91. |
The purpose of smelting an ore isA. add flux to the mineralB. remove the volatile impuritiesC. convert the ore to oxideD. remove the siliceous materials |
| Answer» Correct Answer - C | |
| 92. |
Aluminium is used in the extraction ofA. CrB. FeC. CaD. Mn |
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Answer» Correct Answer - A::D Aluminium is used in the extraction of Cr and Mn. |
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| 93. |
Silver containing lead as an impurity is not purified byA. PolingB. CupellationC. LevigationD. Distillation |
| Answer» Correct Answer - B | |
| 94. |
The extraction of which of the following metals involves bessemerisation ?A. FeB. AgC. AlD. Cu |
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Answer» Correct Answer - D Extraction of copper involves Bessemeri-sation i.e., heating the matte in Bessemer converter. |
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| 95. |
Which method of purification is represented by the following equation `Ti(s)A. Zone refiningB. CupellationC. PolingD. Van -Arkel. |
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Answer» Correct Answer - A Van-Arkel method of purification of metals is based on the thermal decomposition of a volatile iodide formed first by direct combination of metal to be purified and iodine. Metal formed is in its purest form. Metals such as titanium and zirconium are purified by this method. |
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| 96. |
Cassiterite is an ore ofA. MnB. NiC. SbD. Sn |
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Answer» Correct Answer - D Cassiterite is an ore of Sn |
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| 97. |
____________ is concentration by froth flotation process in metallurgy of copperA. CupriteB. ChalcociteC. malachiteD. Haematite |
| Answer» Correct Answer - B | |
| 98. |
The incorrect statement among the following isA. Hydrogen is used to reduce NiOB. Zirconium is refined by Van Arkal methodC. The sulphate ore galena is concentrated by froth floatationD. In the metallurgy of iron, flux used in `SiO_2` |
| Answer» Correct Answer - D | |
| 99. |
Hydrogen will not reduceA. heated cupric oxideB. heated ferric oxideC. heated stannic oxideD. heated aluminium oxide. |
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Answer» Correct Answer - D Fluorspar (`CaF_(2)` ) does not contain aluminium. |
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| 100. |
The answer to each of the following questions is a single digit integer from 0 to 9. If the correct answer to the question number A,B, C and D say 3,0,8,5 respectively, then the correct darkening of bubbles should be as follow. Amonst the following, the ores which are roasted to convert them into their corresponding metal oxides are: Alumina, zinc, blende, iron pyrites, copper pyrites, galena, chalcorite |
| Answer» Correct Answer - 5( Five i.e. Zinc blende, iron pyrites, copper pyrites, galena, chalcorite) | |