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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. |
The most abundant element in the earth crust isA. OB. SiC. goldD. iron |
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Answer» Correct Answer - A |
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| 202. |
Malachite and azurite are_ores of copperA. carbonateB. oxideC. sulphideD. silicate |
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Answer» Correct Answer - 1 |
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| 203. |
Commercially important ore of Lead isA. SideriteB. GalenaC. SphaleriteD. Haematite |
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Answer» Correct Answer - 2 |
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| 204. |
Pyrolusite is the oxide mineral ofA. IronB. SelniumC. MagnanseD. Magnesium |
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Answer» Correct Answer - C |
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| 205. |
Which of the following is not a hydrated oxide mineral?A. BauxiteB. CorundumC. DiasporeD. Gibsite |
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Answer» Correct Answer - 2 |
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| 206. |
Which of the folowing is a sulphide ore?A. MagnetiteB. HaematiteC. CalamineD. Ironpyrites |
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Answer» Correct Answer - 4 |
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| 207. |
Zone refining is based on the principle thatA. impurities of low boiling metals can be seperated by distillationB. impurities are more soluble in molten metal than in solid metalC. different components of a mixture are differently absorbed on a abobentD. vapours of volatile compound can be decomppose in pure metal. |
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Answer» Correct Answer - 2 |
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| 208. |
The chief ore of aluminium isA. AluniteB. BauxiteC. CryoliteD. Feldspar |
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Answer» Correct Answer - B |
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| 209. |
Statement-I : All the ores are mineral Statement-II : Most of the ores contains metals in combined state |
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Answer» Correct Answer - c |
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| 210. |
Which is not a mineral of aluminiumA. AnhydriteB. BauxiteC. CrorundumD. Diaspore |
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Answer» Correct Answer - A |
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| 211. |
Out of `Cu_(2)S,HgS,Ag_(2)S` and ZnS roasting will convert the mineral in to metal case ofA. `Cu_(2)S,Zns`B. Hgs,ZnSC. `Cu_(2)S,Ag_(2)S`D. HgS |
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Answer» Correct Answer - 4 |
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| 212. |
Identify the non-magnetic mineral from the following.A. `SnO_(2)`B. `TiO_(2)`C. `FeWO_(4)`D. `FeO.Cr_(2)O_(3)` |
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Answer» Correct Answer - 1 |
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| 213. |
The formula of calamine ore isA. ZnSB. `FeCO_(3)`C. `ZnCO_(3)`D. `Cu_(2)S` |
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Answer» Correct Answer - C |
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| 214. |
Assertion : In the electrolytic reduction of `Al_(2)O_(3)`, cryolite is used. Reason : Cryolite is an ore of aluminium. |
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Answer» Correct Answer - b |
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| 215. |
`Pb` and `Sn` are exerted from their chief ores by:A. Carbon reduction and self reductionB. Self reduction and carbon reductionC. Electrolysis and self reductionD. Self reduction and electrolysis |
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Answer» Correct Answer - B |
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| 216. |
At which one of the following condition, a reducing a metal oxideA. Sum of the `DeltaG` values for oxidation of metal and oxidation of reductant should be negativeB. Sum of the `DeltaG` values for oxidation of metal and oxidation of reductant should be positiveC. Sum of the `DeltaG` values for reduction of metal oxide and oxidation of reductant should be negativeD. Sum of the `DeltaG` values for oxidation of metal and reduction of reducant should be negative |
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Answer» Correct Answer - C |
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| 217. |
For which one of the following reaction, the graph of `DeltaG` against T is almost horizontal to temperature axisA. `C_((s))+O_(2(g)) to CO_(2)(g)`B. `2C_((s))+O_(2(g)) to 2CO(g)`C. `2CO_((s))+O_(2(g)) to 2CO_(2)(g)`D. `2Mg_((s))+O_(2(g)) to 2MgO(g)` |
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Answer» Correct Answer - A |
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| 218. |
Correct statements from the graph I) Above 1073 K,`DeltaG^(0)` for the formation of `F_(2)O_(3)` is less negative than `DeltaG^(0)` for the formation of CO from carbon II) Above 1073K, Carbon can reduce `Fe_(2)O_(3)` III) Below 1073K, CO can reduce `Fe_(2)O_(3)` IV) In blast furnance, reduction of `Fe_(2)CO_(3)` occurs in different temperature ranges with below 1073K by CO (or) above 1073 K by carbonA. Only IB. I,II onlyC. I,II,III onlyD. All |
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Answer» Correct Answer - 4 |
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| 219. |
Correct statements from the graph I) Above 1073 K,`DeltaG^(0)` for the formation of `F_(2)O_(3)` is less negative than `DeltaG^(0)` for the formation of CO from carbon II) Above 1073K, Carbon can reduce `Fe_(2)O_(3)` III) Below 1073K, CO can reduce `Fe_(2)O_(3)` IV) In blast furnance, reduction of `Fe_(2)CO_(3)` occurs in different temperature ranges with below 1073K by CO (or) above 1073 K by carbonA. Only IB. I,II onlyC. I,II,III onlyD. All |
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Answer» Correct Answer - 4 |
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| 220. |
Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite)` Cathode : fraphite inside Fe -Container Pick out the statement which is wrong if anode is made of nikel instesd of graphoite?A. ni is costlyB. Anode will be affected by the prouct formedC. Graphite remain unaffected by prouced `F_(2)`D. nikkel may be affected at high temperature |
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Answer» Correct Answer - b |
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| 221. |
The formation of the oxide `M_(x)O_(y)`per mole of `O_(2)` cinsumed is written a `(2x)/(y)M_((S))+O_(2(g))to(2)/(y)M_(x)O_(y)` the free energy change of the reaction is given by ?G=?H-T?S. if the ethalpychange?H and ethropy change ?S are assumed to be indendent of temperature the plot of ?G versus T is liner such as shown in th efollowing figure known as Ellingham diagram Figure known a sEllingham diagram Figure is widely used to discuss th priciple ionvolves in the extraction of metal from its oxide. The reduction of by carbon at may be repesented as the free energy of this raction can be obtained from the following two reactions. Choose the correct statement |
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Answer» Correct Answer - a |
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| 222. |
The formation of the oxide `M_(x)O_(y)`per mole of `O_(2)` cinsumed is written a `(2x)/(y)M_((S))+O_(2(g))to(2)/(y)M_(x)O_(y)` the free energy change of the reaction is given by ?G=?H-T?S. if the ethalpychange?H and ethropy change ?S are assumed to be indendent of temperature the plot of ?G versus T is liner such as shown in th efollowing figure known as Ellingham diagram Figure known a sEllingham diagram Figure is widely used to discuss th priciple ionvolves in the extraction of metal from its oxide. The reduction of by carbon at may be repesented as the free energy of this raction can be obtained from the following two reactions. Choose the correct statement |
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Answer» Correct Answer - a |
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| 223. |
For the formation of metal oxide, `deltaG^(@)` __________ with increase in temperature.A. Only IB. I,II onlyC. I,II,III onlyD. All |
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Answer» Correct Answer - 4 |
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| 224. |
The least electropositive metal among the following isA. AuB. MgC. AlD. Zn |
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Answer» Correct Answer - A |
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| 225. |
Assertion: Aluminothermy is used for extraction of chromium form chromium oxide. Reason: Alumina has a high melting point.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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| 226. |
Statement-1: Zn displaces Ag from the complex `Na[Ag(CN)_(2)]` to give `Na_(2)[Zn(CN)_(4)]` Statement-2:Zn is more electro positive than silverA. 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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| 227. |
Statement-1: Carbon is not used as a reducing agent for the extraction of group 2 metals. Statement-2: Carbon reacts with group 2 metal to give carbidesA. 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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| 228. |
Consider the following statements in the extraction of iron from haematite: (I) `CO`is the main reducing agent (II) `Fe_(2)O_(3)`is used to oxidise the impurities be Bessemer process (III) In basic oxygen process, air is used to oxidise the impurities. (IV) When air is used to oxidise the impurities, iron nitride is formed in iron Pick the correct set of statement `(s)`:A. I, IVB. I,IIC. I, II and IIID. I, II and IV |
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Answer» Correct Answer - A |
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| 229. |
Match list-I with List-II |
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Answer» Correct Answer - `(A)to(s);(B)to(p,q);(C)to(r);(D)to(t)` |
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| 230. |
Match list-I with List-II |
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Answer» Correct Answer - `(A)to(s);(B)to(p,q);(C)to(r);(D)to(t)` |
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| 231. |
In Belgan process, for reduction of ZnO to Zn reductant isA. Water gasB. Coal or CokeC. AlD. `H_(2)` |
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Answer» Correct Answer - 2 |
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| 232. |
(A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ore is done by calcinaitonA. 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 - C |
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| 233. |
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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| 234. |
Assertion : `Al_(2)O_(3)` is converted into Al by reduction with carbon at high temp. Reason : Carbon has greater affinity for oxygen than aluminium. |
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Answer» Correct Answer - a |
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| 235. |
Metallic gold frequently is found is aluminosilicate rocks and it is finely dispersed among other minerals it may be extracted by treating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to `[Au(CN)_(2)]^(-)`, which is soluble in water. After equilibrium has been reached, the aqueous is pumped off and the metallic gold is recovered form it by reacting the gold complex with zinc, which is converted to `[Zn(CN)_(4)]^(2-)` . Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore. The correct reaction involved in the leaching of gold with dilute solution of NaCN is :A. `4Au+8CN^(-)+2H_(2)O+O_(2)"(air)" rarr4[Au(CN)_(2)]^(-)+4OH^(-)`B. `Au+2CN^(-) rarr Au[(CN)_(2)]^(-)`C. `Zn+2CN^(-) rarr Zn[(CN)_(2)]^(-)`D. `Zn+4CN^(-) rarr Zn[(CN)_(4)]^(-)` |
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Answer» Correct Answer - d |
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| 236. |
If a metal has low oxygen affinity then the purification of metal may be carried out by :A. liquationB. distillationC. zone refiningD. cupellation |
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Answer» Correct Answer - 4 |
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| 237. |
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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| 238. |
Which of the following has maximum thermodynamic spontaneously at `400^(@)C`?A. `C+O_(2) to CO_(2)`B. `2C+O_(2) to 2CO`C. `2CO+O_(2) to 2CO_(2)`D. all have same |
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Answer» Correct Answer - C |
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| 239. |
100% copper is obtained from crude copper byA. Zone refiningB. electrorefiningC. liqationD. poling |
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Answer» Correct Answer - B |
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| 240. |
If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out byA. CupelallationB. electrorefiningC. Zone refiningD. POILING |
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Answer» Correct Answer - A |
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| 241. |
The chemical reaction that involves roasting process is :A. `Fe_(2)O_(3)+3COto2Fe+2CO_(2)`B. `2Al+Fe_(2)O_(3)to2Fe+Al_(2)O_(3)`C. `2Zns+3O_(2)to2ZnO+3SO_(2)`D. `FeO+SiO_(2)toFeSiO_(3)` |
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Answer» Correct Answer - 3 |
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| 242. |
For reactions of metals to form their oxide one gram `O_(2)` molecule is used may be plotted graphically against temperature Select incorrect using given Ellingham diagram (given above)A. At ` 710^(@)C-2CO(g)+O_(2)(g) rarr 2CO_(2)(g), DeltaG^(0)=x kJ//mol`B. At ` 710^(@)C-C(s)+O_(2)(g) rarr CO_(2)(g), DeltaG^(0)=x kJ//mol`C. At ` 710^(@)C-2C(s)+O_(2)(g) rarr 2CO_(2)(g), DeltaG^(0)=x kJ//mol`D. At ` 710^(@)C-CO_(2)(g)+C(2)(g) rarr 2CO(g), DeltaG^(0)=x kJ//mol` |
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Answer» Correct Answer - 4 |
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| 243. |
For reactions of metals to form their oxide one gram `O_(2)` molecule is used may be plotted graphically against temperature Select incorrect using given Ellingham diagram (given above)A. At ` 710^(@)C-2CO(g)+O_(2)(g) rarr 2CO_(2)(g), DeltaG^(0)=x kJ//mol`B. At ` 710^(@)C-C(s)+O_(2)(g) rarr CO_(2)(g), DeltaG^(0)=x kJ//mol`C. At ` 710^(@)C-2C(s)+O_(2)(g) rarr 2CO_(2)(g), DeltaG^(0)=x kJ//mol`D. At ` 710^(@)C-CO_(2)(g)+C(2)(g) rarr 2CO(g), DeltaG^(0)=x kJ//mol` |
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Answer» Correct Answer - 4 |
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| 244. |
The common method for the extraction of metals from the oxide ore is :A. Reduction with carbonB. reduction with AlC. reduction with `H_(2)`D. electrolytic method |
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Answer» Correct Answer - 1 |
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| 245. |
Which of the following is incorrectly matched? |
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Answer» Correct Answer - 2 |
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| 246. |
Select incorrectly matched (1)One has different nautre of oxide than other two -Zn,Al B (2) One is not extracted by carbon reduction but other two are -Sn, Ag. Zn(from their name ore) (3) One has different magnetic nautre than other two `-O_(2), Hg[Co(SCN)_(4)],[NiCl_(4)]^(2-)` (4) One has different hydridised central atom than other two `-MgO_(4)^(-),CrO_(4)^(-),ClO_(4)^(-)`A. One has different natuer of oxide than other two -Zn, Al BB. One is not extracted by carbon reduction but other two are -Sn, Ag. Zn(from their ore)C. I, II and IIID. I, II and IV |
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Answer» Correct Answer - C |
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| 247. |
Which is incorrectly matched for refining of element?A. Si, Ge from impuritie` implies` zone refining methodB. Sn refined from `SnO_(2) implies`poling methodC. Zn,Cd from impurities with high boiling point `implies`liquationD. Al from impurities Cu, Fe `implies` hoop method |
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Answer» Correct Answer - 3 |
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| 248. |
Statement-1: Extraction of gold from its native ore involves leaching the metal wih dilute solution of NaCN in presence of air. Statement-2:This is an oxidation reaction and leads to the formation of a soluble complex.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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| 249. |
Statement-1: Silica is added as a flux in reverberatory furnance, in the extraction of copper from copper pyrites. Statement-2: Silica decreases the melting point of the ore and remove the impurity of lead sulphide as `PbSiO_(3)`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 - c |
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| 250. |
Consider the following reaction at `1000^(@)C` `(A) Zn_((s))+(1)/(2)O_(2(s))+ZnO_(s),DeltaG^(0)=-360kJ"mole"^(-1)` (B) `(B) Cn_((s))+(1)/(2)O_(2(g))to CO_(s),DeltaG^(0)=-460kJ"mole"^(-1)` choose the correct statement at `1000^(0)C`A. Zinc can be oxidized by COB. Zinc oxide can be reduced by CC. Both staements 1 and 2 are trueD. Both statement 1 and 2 are false |
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Answer» Correct Answer - B |
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