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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. |
To carry out a reduction process, select a temperature so as to makeA. `deltaG` negativeB. `deltaG` positiveC. `deltaH` negativeD. `deltaH` positive. |
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Answer» Correct Answer - (A) |
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| 202. |
What type of flux is used when the sugarcane is acidic ?A. AcidicB. BasicC. NeutralD. Alcoholic |
| Answer» Correct Answer - B | |
| 203. |
Identify the process when an ore is heated in limited supply of air.A. `2Cu_(2)S + 3O_(2) to 2Cu_(2)O + 2SO_(2)`B. `Fe_(2)O_(3) +3CO to 2Fe+3CO_(2)`C. `PbO +C to Pb +CO`D. `Al_(2)O_(3) + 3C to 2Al + 3CO` |
| Answer» Correct Answer - C | |
| 204. |
The process in which the ore is heated in excess of air below its metling point is known asA. RoastingB. CalcinationC. ReductionD. Distillation. |
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Answer» Correct Answer - A In Roasting ore is heated in free supply of air while in calcination the ore is heated in a limited supply of air in both cases below its metling point. |
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| 205. |
Which of the following is sugarcane ?A. Waste material left after concentrationB. Waste material left after purification of metalC. Waster material after electrolysisD. Waste material present in ore to be removed during concentration |
| Answer» Correct Answer - D | |
| 206. |
Identify the prcess when an ore is heated in the presence of oxygen.A. SmeltingB. RoatingC. CalcinationD. Liquation |
| Answer» Correct Answer - B | |
| 207. |
The rocky and siliceous matter associated with an ore is called:A. SilagB. MineralC. Matrix or GangueD. Flux |
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Answer» Correct Answer - C The rocky and silicious matter associated with an ore is called matrix of gangue. |
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| 208. |
Froth floatation process may be used to increase the concentration of the mineral inA. ChalopyritesB. BauxiteC. HaematiteD. Calamine |
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Answer» Correct Answer - A Carnallite is an important ore of magnesium. |
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| 209. |
Which of the following is the chemical composition of diaspore ?A. `Al_(2)O_(3) * 2H_(2)O`B. `Al_(2)O_(3)*H_(2)O`C. `Al_(2)O_(3)`D. `Na_(3), AlF_(6)` |
| Answer» Correct Answer - B | |
| 210. |
In which of the following mineral aluminium is not present ?A. CryoliteB. MicaC. FeldsparD. Fluorspar |
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Answer» Correct Answer - D Argentite `(Ag_(2)S)` is not an oxide ore. ] |
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| 211. |
Which is not a mineral of aluminiumA. DiasporeB. BauxiteC. kaoliniteD. Siderite |
| Answer» Correct Answer - D | |
| 212. |
Froth floatation process may be used to increase the concentration of the mineral inA. ChalcopyritesB. BauxiteC. HaematiteD. Calamine |
| Answer» Correct Answer - A | |
| 213. |
Which of the following is a mineral of iron ?A. MalachiteB. DiasporeC. SideriteD. Azurite |
| Answer» Correct Answer - C | |
| 214. |
When the impurities are removed from an ore, the metal becomes liable toA. CalcinationB. OxidationC. Magnetic concentrationD. Reduction |
| Answer» Correct Answer - D | |
| 215. |
The substance which reacts with gangue to form fusible mineral is called _________A. SlagB. OreC. FluxD. Catalyst |
| Answer» Correct Answer - C | |
| 216. |
During smelting, an additional substance is added which combines with impurities to form a fusible product. The substance added is known as :A. OreB. FluxC. SlagD. Gangue |
| Answer» Correct Answer - B | |
| 217. |
During smelting an additional substance is added which combines with impurities to foem a fusible product. It is known asA. SlagB. MudC. GangueD. Flux |
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Answer» Correct Answer - D During smelting flux combines with the gangue (impurity ) to form slag (fusible product. ) |
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| 218. |
Assertion: Wolframite impurity is separated from tin stone `(SnO_(2))` by magnetic separation. Reason: Tin stone is ferromagnetic and is attracted by the magnet.A. Both A and R ar true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - C Wolframite is ferromagnetic and is attacted by the magnet. |
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| 219. |
Impure tin contains `SnO_(2)` as one of the impurities. Name the specific method employed for converting `SnO_(2)` present in impure metal to tin. |
| Answer» Poling is used as a method of purification of metals when they have their oxides as impurity. For example, `Cu` has `Cu_(2)O` as impurity, `Sn` has `SnO_(2)` as impurity,e tc. | |
| 220. |
Wolframite is seperated from cassitertite byA. Froth floatation methodB. LevigationC. Electromagnetic seperation methodD. Electrostatic seperation method. |
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Answer» Correct Answer - C Wolframite (ferromagnetic) is seperated from cassiterite (non-magnetic) by magnetic seperation method. |
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| 221. |
Tin stone (cassiterite) is purified by magnetic separation method. Name and formulate the magnetic chemical present with it. |
| Answer» Wolframite (ferrous tungstate) `FeWO_(4)` is the magnetic impurity present with tin stone which is separated by magnetic separation method. | |
| 222. |
Which chemical works as reducing agent in the process of poling ? |
| Answer» Hydrocarbons, mainly `CH_(4)`. | |
| 223. |
Hydrogen is used as a reducing agent in the extraction ofA. MoB. CaC. WD. Na |
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Answer» Correct Answer - A::C `H_(2)` is used as a reducing agent for the extraction of Mo and W. |
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| 224. |
In the extraction of Fe from `Fe_(2)O_(3)` the reducing agent isA. CB. AlC. electrolytic reductionD. Cu |
| Answer» Correct Answer - A | |
| 225. |
Assertion: Carbon is not used as a reducing agent for the extraction of group 2 metals, Reason: Carbon react with group 2 metals to give carbides.A. Both A and R ar true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - A Both Assertion(A) and reason(R) are true and R is the correct explanation of A. |
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| 226. |
Name the compound that contains Mg and helps green plants during photosynthesis. |
| Answer» The compound that contains Mg and helps green plants during photosynthesis is chlorophyll. | |
| 227. |
From the following reactions. Identify `A` to `F` `Mg overset("air"/Delta)(to)"Colourless solid" (A) overset(HCl)(to)"colourless solution"(B) overset(Na_(2)CO_(3))(to)"White ppt"(C )overset(Delta)(to)underset("white ppt"(F))underset(darrCa(OH)_(2))underset("gas")underset("colourless")((E))+(D)` |
| Answer» `AtoMg_(3)N_(2)`, `BtoMgCl_(2)`, `CtoMgCO_(3)`, `DtoMgO`, `EtoCO_(2)`, `FtoCaCO_(3)` | |
| 228. |
Cryolite isA. `Na_(3)AlF_(6)` and is used in the elctrolysis of alumina for decreasing elecrical conductivityB. `Na_(3)AlF_6` and is usual in the electrolysis of alumina for lowering the melting point of aluminaC. `Na_(3)AlF_6` and is used in the electrolytic purification of aluminaD. `Na_(3)AlF_6` and is used in the electrolysis of alumina . |
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Answer» Correct Answer - B Cryollite is `Na_(3)AlF_(6)` and is used in the electrolysis of alumina. It reduces the melting point of alumina. |
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| 229. |
Explain the following `(i)` Excess of carbon is added to zinc metallurgy. `(ii)` In the elctrolysis of alumina, cryolite is added to alumina. `(iii)` Coke does not cause reduction of `Al_(2)O_(3)`. `(iv)` Gold is soluble in aquaregia, silver is not. |
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Answer» `(i)` As both `Zn` and `C` have nearly equal affinities for `O` atoms i.e. `(DeltaG^(@)=-360kJ "for" Zn)(DeltaG^(@)=-460kJ "for" C)` So excess of carbon is added to reduce `ZnO` to `Zn`. `2Zn+O_(2)to2ZnO` DeltaG^(@)=-360kJ`…….`(i)` `2C+O_(2)to2CO` `DeltaG^(@)=-460kJ`.........`(ii)` From equation `(i)` and `(ii)` we get, `ZnO+CtoZn+CO`, `DeltaG=-50kJ//mol` `(ii)` Pure alumina has very high fusion temperature and is bad conductor of electricity . To reduce its fusion temperature and to make it good conductor of electricity, cryolite is added. `(iii)` `Al_(2)O_(3)+Cto2Al+3CO` `DeltaG^(@)=3DelltaG_(f)^(@)(CO)-DeltaG_(f)^(@)(Al_(2)O_(3))` `=-3(137.2)+1582` `=+ve` Hence, reaction is not spontaneous `(iv)` Gold forms soluble `AuCl_(3)` while silver forms white precipitate. |
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| 230. |
Gravity seperation process may be used for the concentration ofA. ChalcopyritesB. BauxiteC. HaemattieD. Calamine. |
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Answer» Correct Answer - (C ) |
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| 231. |
In Mc-Arthur Forrest method silver is extracted from the solution of `Na[Ag(CN)_(2)]` by the use ofA. FeB. NaC. ZnD. Au |
| Answer» Correct Answer - C | |
| 232. |
When compared , `deltaG^(o)` for the formation of `Al_(2)O_3` ,the `deltaG^(o)` for the formation of `Cr_(2)O_3` isA. sameB. unpredictedC. higherD. lower |
| Answer» Correct Answer - C | |
| 233. |
Electromagnetic seperation is used in the concentration ofA. Copper pyritesB. BauxiteC. CassiteriteD. Cinnabar |
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Answer» Correct Answer - C Electromagnetic seperation is used in the concentration of cassiterite |
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| 234. |
Which of the flowing metal is extracted by the electrometallurigical method?A. CuB. FeC. NaD. Ag |
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Answer» Correct Answer - C Na is extracted by electrometallurgical process. |
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| 235. |
Match List I with List II and select the correct answer using the codes given below the lists: A. (I-c), (II-a), (III-d), (IV-b)B. (I-d), (II-b), (III-c), (IV-a)C. (I-c), (II-b), (III-d), (IV-a)D. (I-d), (II-a), (III-c), (IV-b) |
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Answer» Correct Answer - B Cyanide process is used for the extraction of Au. Floatation process is used for the concentration of sulphide ores. It uses pine oil. Electrolytic reduction is used for the extraction of Al. Zone refining is used to get ultrapure Ge. |
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| 236. |
The magnetic ore isA. Ferrous oxideB. Ferric oxideC. Ferric hydroxideD. Ferrosoferric oxide |
| Answer» Correct Answer - D | |
| 237. |
Blister copper isA. Impure CuB. Cu alloyC. pure CuD. copper having 1% impurity |
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Answer» Correct Answer - D Theoretically Al can reduced MgO to Mg above 1623 K .Since Mg is costelier than Al and a higher temperature (gt 1623 K) is difficult to maintain. Therefore, Mg is usually obtained by reduction of MgO by Al . |
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| 238. |
Cassiterite is an ore ofA. PbB. ZnC. SnD. Mn |
| Answer» Correct Answer - C | |
| 239. |
Extraction of metal from the ore cassiterite involvesA. carbon reduction of an oxide oreB. self-reduction of a sulphide oreC. removal of copper impurityD. removal of iron impurity. |
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Answer» Correct Answer - A Cassiterite is `Sn_(2)O` - an ore of tin. Therefore, its extraction involves carbon reduction of the oxide ore. This ore has iron tungstate as impurity , so the extraction involves removal of iron ore. Options A and D is valid. |
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| 240. |
Assertion : In the metallury of aluminium , purified `Al_(2)O_(3)` is mixed with `Na_(3)AlF_(6)` or `CaF_(2)` . Reason : `Na_(3)AlF_(6)` or `CaF_(2)` lowers the melting point of mixture and increases its conductivity.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 | |
| 241. |
Which one of the following benefication process is used for the mineral . `Al_(2)O_(3).2H_(2)O ` ?A. Froth floatationB. LeachingC. LiquationD. Magnetic seperation |
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Answer» Correct Answer - B Leaching is done for Bauxite `Al_(2)O_(3).2H_(2)O` . |
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| 242. |
Which of the following oxide cannot be reduced to metal by carbon ?A. ZnOB. FeOC. `Al_(2)O_(3)`D. CuO |
| Answer» Correct Answer - C | |
| 243. |
Which of the following oxide cannot be reduced to metal by carbon ?A. CuOB. HgOC. `Al_(2)O_(3)`D. `Fe_(2)O_(3)` |
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Answer» Correct Answer - C |
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| 244. |
Formula of Magnetite is _____________ .A. `Fe_(2)O_(5)`B. `FeO`C. `Fe_(3)O_(4)`D. `Fe_(2)O_(3)` |
| Answer» Correct Answer - C | |
| 245. |
Among the following groups of oxides, the group that cannot be reduced by carbon to give the respective metals.A. `Cu_(2)O, Sn_(2)O`B. `Fe_(2)O_(3)`, ZnOC. CuO, `K_(2)O`D. PbO , `Fe_(3)O_(4)` |
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Answer» Correct Answer - C Oxides of highly reactive metals are not reduced by carbon. |
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| 246. |
Calcination is used in matallurgy for removal ofA. Water and sulphideB. Water and `H_(2)S`C. Water and `CO_(2)`D. Water and CO |
| Answer» Correct Answer - C | |
| 247. |
Which of the following is magnetite ?A. `Fe_(2)CO_(3)`B. `Fe_(2)O_(3)`C. `Fe_(3)O_(4)`D. `Fe_(2)O_(3)*3H_(2)O` |
| Answer» Correct Answer - C | |
| 248. |
Removal of the unwanted materials from the ore is known asA. concentration , dressing , benefactionB. speration , refining , gangueC. magnetic seperation, purification, gangueD. washing, refining, amalgamation |
| Answer» Correct Answer - A | |
| 249. |
The substance which is added to ore in order to remove impurities during smelting is calledA. SlagB. GangueC. FluxD. Matrix. |
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Answer» Correct Answer - C Flux combines with impurities to form slag. |
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| 250. |
The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated . This method of concentration is known asA. metallurgyB. leachingC. gravity separationD. froth floatation process. |
| Answer» Correct Answer - C | |