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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.
| 201. |
Which of the following represents the thermite reaction ?A. `3Mn_(3)O_(4)+8Al to 9Mn+4Al_(2)O_(3)`B. `MgCO_(3)+SiO_(2) to MgSiO_(3)+CO_(2)`C. `Cu_(2)S+2Cu_(2)O to 6Cu+SO_(2)`D. `Fe_(2)O_(3)+3CO+to 2Fe+3CO_(2)` |
| Answer» Correct Answer - A | |
| 202. |
Which of the following process(es) occur(s) during the extraction of copper from chalcopyrites?A. froth floatation methodB. RoastingC. bessermerisationD. Calcination |
| Answer» Correct Answer - A,B,C | |
| 203. |
Liquation process may be applied for the purification of:A. copperB. tinC. ironD. bismuth |
| Answer» Correct Answer - B,D | |
| 204. |
The reaction(s) which (do) not occur in the reduction zone in the extraction of iron from haematite ore is(are):A. `Fe_(2)O_(3)+CO to 2FeO+CO_(2)`B. `FeO+CO to Fe+CO_(2)`C. `Fe_(2)O_(3)+3C to 2Fe+3CO`D. `CaO+SiO_(2) to CaSiO_(3)` |
| Answer» Correct Answer - C,D | |
| 205. |
Statement-1: Aluminium is used as reducing agent in the commercial extraction of iron from haematite ore. Statement--2: Reduction of `B_(2)O_(3)` to boron by aluminuim is called as Goldschmidt aluminothermicprocess.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 | |
| 206. |
Consider the following statement: Statement-1: In extraction of iron from haematite ore, the reduction reactions take place only in the lower temperature range in the blast furnace. Statement-2:Calamine is an carbonate ore of zinc. ltbr Statement-3: The principle opre of aluminium, bauxite, usually contains silica, iron oxides and titanium, oxide as impurities. Statement-4:Solidified copper obtained from silica lined convertor (Bessemer converter) has blistered appearance due to the evolution of `SO_(2)` and arrange in the order of true/false.A. FTTTB. FTFFC. FFTTD. TFFT |
| Answer» Correct Answer - A | |
| 207. |
The majore role of flurospar `(CaF_(2))` which is added in small quantities in the electrolytic reduction of aluminia dissolved in fused cryolite `(Na_(3)AIF_(6))` is:A. as a catalystB. to make the fused mixture very conductingC. to lower the temperature of the melting of the molt.D. to decrease the rate of oxidatoin of carbon at anode |
| Answer» Correct Answer - B,C | |
| 208. |
Assertion: Durig calcination the ore is heated well below its melting point in the limited supply of air or absence of air. Reason: The process of calcination is carried out for sulphide ores.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 | |
| 209. |
Calcination silicate(slag) formed in the slag formation zone in extraction of iron from haematite ore:A. does not dissolve in molten ironB. being lighter floats on the molten ironC. is used in cement industry and as building materialD. prvents the re-oxidation of molten iron |
| Answer» Correct Answer - A,B,C,D | |
| 210. |
Which of the following ore is converted into oxide by roasti but not by calcination?A. ChalcociteB. CerrusiteC. AnglesiteD. Dolomite |
| Answer» Correct Answer - A | |
| 211. |
`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[Zn(CN)_(4)]`C. PbS forms soluble complex `Na_(2)[Pb(CN)_(4)]`D. they cannot be separated by adding NaCN |
| Answer» Correct Answer - B | |
| 212. |
Smithsonite is American name of….ore (European name). Metal is extracted from Smithsonite by calcination followed by carbon reduction, Europeach name of Smithsonite is:A. CalamineB. bauxiteC. dolomiteD. sphalerite |
| Answer» Correct Answer - A | |
| 213. |
Froth floatation process for the concentration of sulphide ore is an illustration of the practical application ofA. adsorptionB. absorptionC. coagulationD. sedimentation |
| Answer» Correct Answer - A | |
| 214. |
Statement-1:Sulphide ores are concentrated by froth floatation process. Statement-2: Pine oil acts as a frothing agent in froth floatation process.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 | |
| 215. |
Which one of the following ores is the best concentrated by froth floatation method?A. MalachiteB. MagnetiteC. SideriteD. Galena |
| Answer» Correct Answer - D | |
| 216. |
In the froth floatation process for the facilitation of ores the ore particles float becauseA. they are lightB. they are insolubleC. their suface is preferentially wetted by oilD. they bear an electrolytic charge |
| Answer» Correct Answer - C | |
| 217. |
The number of sulphide ores which are reduced by self redcution to produce their respective crude metals are: `ZnS,Cu_(2)S,PbS, FeS_(2), HgS` |
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Answer» Correct Answer - 3 `Cu_(2)S, PbS,HgS` |
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| 218. |
Which of the following reduction are actually employed in commercial extraction of metals?A. `Fe_(2)O_(3)+2Al to Al_(2)O_(3)+2Fe`B. `Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr`C. `2Na[Au(CN)_(2)]+Zn to Na_(2)[Zn(CN)_(2)]+2Au`D. `2Cu_(2)S+2CuO to 6Cu+SO_(2)` |
| Answer» Correct Answer - B,C,D | |
| 219. |
Main source of lead is galena `(PbS)`. It is converted to Pb by `:` Self`-` reduction process is `:`A. only PB. only QC. both P and QD. None of these |
| Answer» Correct Answer - B | |
| 220. |
Main source of lead is `PbS`. It is convered to `Pb` by: Self- reduction process is:A. XB. YC. ZD. None of these |
| Answer» Correct Answer - B | |
| 221. |
The chemical composition of slag formed during the smelting process in the extraction of copper isA. `Cu_(2)O+FeS`B. `FeSiO_(3)`C. `CuFeS_(2)`D. `Cu_(2)S+FeO` |
| Answer» Correct Answer - B | |
| 222. |
Which one of the following ore is not the ore iof Cu?A. ChalcopyriteB. ChalcociteC. PyrolusiteD. Cuprite |
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Answer» Correct Answer - C `"Pyrolusite"-MnO_(2)` |
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| 223. |
Self reduction is not applied for the extraction of:A. CuB. PbC. HgD. Al |
| Answer» Correct Answer - D | |
| 224. |
Which iof the following reactions represents the self-reduction process?A. B. C. D. All of the above |
| Answer» Correct Answer - D | |
| 225. |
Which of the following reaction(s) in blast furnace during extraction of iron?A. `CaO+SiO_(2) to CaSiO_(3)`B. `Fe_(2)O_(3)+3CO to 2Fe+3CO_(2)`C. `FeO to Fe+(1)/(2)O_(2)`D. `P_(2)O_(5)+5C to (1)/(2)P_(4)+5CO` |
| Answer» Correct Answer - A,B,D | |
| 226. |
The smelting of iron in a blast furnace involves the following processes:A. CombustionB. reductionC. Slag formationD. fusion |
| Answer» Correct Answer - A,B,C,D | |
| 227. |
Statement-1: All ores are minaerals but all minerals are not ores. Statement-2: Minerals are obtained from mines.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 | |
| 228. |
We have two minerals of one metal, frst is sulphide and second is oxide. Then find the correct staement regarding extraction of metal from these two minerals.A. Sulphide mineral is good choice for extraction of metalB. Oxide mineral is good choice for extraction of metalC. Any of these two may be ore, depends on the concentration of the metal in the minerals, durability of the process and other relevant factorsD. Always sulphide mineral will be the ore |
| Answer» Correct Answer - C | |
| 229. |
In order to obtain metal from its oxide through Blast furnace process, the following reactions are involved. `Fe_(2)O_(3)+CO to Fe_(3)O_(4)+CO_(2)` `Fe_(3)O_(4)+CO to Fe+CO_(2)` `FeO+CO to Fe+CO_(2)` If the % yield of the first, second and third reactions are 80% and 60% ,50% respectively then calculate mass of iron (in gm) which will be obtained if 16g of `Fe_(2)O_(3)` is reacted with excess of CO. |
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Answer» Correct Answer - 2688 `(16xx10^(3))/(160)xx2xx0.8xx0.6xx0.5=48"moles" or 2688g` |
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| 230. |
All minerals are not ore but all ores are minerals. The extraction of a particular metal depends upon several factor and overall it has to be convenitent and economical. Following common steps are involved in extraction of metal from its prime ore: (a) Pulverisation (b) Concentration (c) Calcination/Roasting (d) Smelting and Reduction (e) Purifaction of crude metal Which of the following options is correct? State true and false (P) `Fe_(2)O_(3)` can be reduced by coke as well as aluminium. (Q) Red bauxite is is concentrated by leaching method. (R ) Impure Zn is purified by either distilation or electrolytic is refining method. (S ) Wrought iron is a purest form of iron.A. TTTTB. FTTTC. FTFTD. TFTF |
| Answer» Correct Answer - A | |
| 231. |
The reactions which is not involved in the extraction of iron from the mixture from the mixture of its ores: `(Fe_(2)O_(3)+Fe_(2)O_(3).3H_(2)O+FeO_(3)+Fe_(3)O_(4))`A. `Fe_(2)O_(3)+3CO to 2Fe+3CO_(2)`B. `Fe_(2)O_(3)+3C to 2Fe+3CO`C. `SiO_(2)+C to Si+CO_(2)`D. `CaO+SiO_(2) to CaSiO_(3)` |
| Answer» Correct Answer - C | |