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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. |
Match the extraction processes listed in column I with metals listed in column II. A. a-p,r, b-p,r, c-q , d-sB. a-p,b-p,r , s: c-p,q,d-sC. a-p, b-r, s:c-p, q, d-rD. a-p,s, b-p,r,c-q, d-s, r |
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Answer» Correct Answer - A |
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| 52. |
In Goldschmidt alumino thermic process, which of the following reducing agents is used:A. CalciumB. CokeC. Al powderD. Sodium |
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Answer» Correct Answer - 3 |
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| 53. |
Extraction of Zn is based on the following thermodynamic reaction. (A)` 2ZnS + 3O_(2) to 2ZnO+ 2SO_(2)` (B) `ZnO + C to Zn + CO" " DeltaG_(f)^(0)` are given `ZnS = - 2 xx 10^(2) kJ//"mol"` `SO_(2) = -3 xx 10 ^(2) KJ//"mole"` `CO_(2) = -2 xx 10 ^(2)KJ//"mole"` `ZnO = -3 xx 10^(2) KJ//"mol"` `DeltaG^(0)` for the reaction (A) is -` X xx 10^(5) J//"mol"` The value of X a will be |
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Answer» Correct Answer - 8 |
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| 54. |
`NaCN` is sometimes added in the frouth flotation process as a depresant when `ZnS` and `PbS` minerals are expected because:A. `Pb(CN)_(2)` is precipitated while no effect on ZnSB. ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]`C. PbS forms soluble complex `Na_(2)[Pb(CN)_(4)]`D. They cannot be separated by adding NaCN |
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Answer» Correct Answer - a,b |
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| 55. |
Van Arkel method of purification of metals involves converting the metal toA. Volatile stable compoundB. Non-volatile stable compoundC. Volatile unstable compoundD. None of these |
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Answer» Correct Answer - 1 |
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| 56. |
Statement - 1 : `PbSiF_(6) + H_(2) SiF_(6)` + gelatine is taken as electrolyte in electrolytic refining of lead . Statement -2 : Discharge potential of `Pb^(2+)` is less than `H^(+)`.A. Statement - 1 is true , Statement -2 is True , Statement -2 is a correct explanation for statement -1B. Statement -1 : is true , Statement-2 is true , Statement -2 : Not a correct explanation for statement - 1C. Statement-1 : is true , Statement -2 is false ,D. Statement-1 : is false , statement-2 : is true |
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Answer» Correct Answer - c |
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| 57. |
Which one of the following is true in electrolytic refining ?A. impure metal is made cathodeB. impure metal is made anodeC. impure metal is made cathode and pure metal as anodeD. both electrodes must be pure metal |
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Answer» Correct Answer - 2 |
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| 58. |
Van Arkel method of purification of metals involves converting the metal toA. Volatile compound decomposes over a metal surfaceB. volatile compound does not decompose over a metal surfaceC. non- volatile stable compoundD. non-volatile unstable compound |
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Answer» Correct Answer - A |
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| 59. |
In the froth floatation process for the purification of minerals the particles float becauseA. they are lightB. they insolubleC. Their surface is preferentially wetted by oilD. They bear an electrostatic charge. |
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Answer» Correct Answer - C |
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| 60. |
The olive oil used in froth floatation process is calledA. Frothing agentB. Lubricating agentC. Conditioning agentD. Both 1 and 2 |
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Answer» Correct Answer - A |
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| 61. |
Which of the following is used as conditioner in froth floatation processA. Pine oilB. Sodium ethyl xanthateC. Sodium carbonateD. Olive oil |
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Answer» Correct Answer - C |
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| 62. |
The extraction of metal from the ore isA. an oxidation processB. a reduction processC. a hydration processD. a neutratlisaiton process |
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Answer» Correct Answer - B |
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| 63. |
Oxygen and hydrogen gases are produced at the anode and cathod erespectively during electrolysis of dilute aq. Solution ofA. `Na_(2)SO_(4)`B. `AgNO_(3)`C. HClD. `CuSO_(4)` |
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Answer» Correct Answer - A |
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| 64. |
Which of the following statement(s) is (are) true?A. In process of the precipatation of silver from sodium dicyano argentate (I), the zinc acts as reducing agent as well as complexing agent.B. In the process of roasting , the copper pyrites is converted inot a mixture of `Cu_(2)` & `FeS` which, in turn, are partially oxidisedC. Limonite , haemattien and magnesite are ores of iron.D. Tin and lead both are extracted from their ores by self- ruduction. |
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Answer» Correct Answer - A::B |
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| 65. |
Ellingham diagram is given below for the formation of some oxides. The select the correct combination A. Below `T_(2).Al_(2)O_(3)+3Mg® MgO+2Al,DG=-ve`B. Below `T_(3),MgO+CO® CO_(2)+Mg,DG=-ve`C. Above `T_(4),Al_(2)O_(3)+3CO® 2Al+3CO_(2) DG=-ve`D. Below`T_(1)` MgO is in liquid state |
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Answer» Correct Answer - 1 |
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| 66. |
Chemical leaching is useful in the concentration ofA. copper pyritesB. bauxiteC. galenaD. cassiterite |
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Answer» Correct Answer - 2 |
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| 67. |
Electrolysis is an impotant technique for extraction of metals, and each of the solution needs a minimum voltage to get discharged and this value is expressed in terms of discharge potential. For some metal ions the discharge potential follow the order given below: `Li^(+) gt K^(+) gt Ca^(2+) gt Na^(+) gt Mg^(2+) gt Al^(3+) gt Zn^(2+) gt Fe^(2+) gt Ni^(2+)` `H_(3)O gt Cu^(2+) gt H_(2)^(2+) gt Ag^(+) gt Au^(3+)`. For some anions the discharge potentials:- `SO_(4)^(2-) gt BO_(3)^(-) OH^(-) gt Br^(-) gt I^(-)` When aqueous solution of cupric bromide is electrolysed, the product obtained at cathode will beA. CuB. `H_(2)`C. `Br_(2)`D. `O_(2)` |
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Answer» Correct Answer - d |
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| 68. |
Electrolysis is an impotant technique for extraction of metals, and each of the solution needs a minimum voltage to get discharged and this value is expressed in terms of discharge potential. For some metal ions the discharge potential follow the order given below: `Li^(+) gt K^(+) gt Ca^(2+) gt Na^(+) gt Mg^(2+) gt Al^(3+) gt Zn^(2+) gt Fe^(2+) gt Ni^(2+)` `H_(3)O gt Cu^(2+) gt H_(2)^(2+) gt Ag^(+) gt Au^(3+)`. For some anions the discharge potentials:- `SO_(4)^(2-) gt BO_(3)^(-) OH^(-) gt Br^(-) gt I^(-)` The product formed at anode and cathode, when dilute `H_(2)SO_(4)` is electrolysed are:A. `SO_(2),H_(2)`B. `SO_(3),H_(2)`C. `H_(2)S_(2)O_(8),H_(2)`D. `O_(2),H_(2)` |
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Answer» Correct Answer - a |
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| 69. |
Electrolysis is an impotant technique for extraction of metals, and each of the solution needs a minimum voltage to get discharged and this value is expressed in terms of discharge potential. For some metal ions the discharge potential follow the order given below: `Li^(+) gt K^(+) gt Ca^(2+) gt Na^(+) gt Mg^(2+) gt Al^(3+) gt Zn^(2+) gt Fe^(2+) gt Ni^(2+)` `H_(3)O gt Cu^(2+) gt H_(2)^(2+) gt Ag^(+) gt Au^(3+)`. For some anions the discharge potentials:- `SO_(4)^(2-) gt BO_(3)^(-) OH^(-) gt Br^(-) gt I^(-)` When conc. `H_(2)SO_(4)` is electrolyzed with high current carrying Pt electrodes, the product obtained at anode isA. `SO_(2)`B. `SO_(3)`C. `O_(3)`D. `H_(2)S_(2)O_(8)` |
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Answer» Correct Answer - d |
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| 70. |
`FeCr_(2)O_(4)+NaOH+"air" to (A)+Fe_(2)O_(3)` `(A)+(B) to Na_(2)Cr_(2)O_(7)` `Na_(2)Cr_(2)O_(7)+X overset(Delta)to Cr_(2)O_(3)` `Cr_(2)O_(3)+Y overset(Delta)to Cr` Compound (A) and (B) are :A. `Na_(2)Cr.O_(4),H_(2)SO_(4)`B. `Na_(2)Cr_(2)O_(7),HCl`C. `Na_(2)CrO_(5),H_(2)SO_(4)`D. `Na_(4)[Fe(OH)_(6)],H_(2)SO_(4)` |
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Answer» Correct Answer - a |
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| 71. |
`FeCr_(2)O_(4)+NaOH+"air" to (A)+Fe_(2)O_(3)` `(A)+(B) to Na_(2)Cr_(2)O_(7)` `Na_(2)Cr_(2)O_(7)+X overset(Delta)to Cr_(2)O_(3)` `Cr_(2)O_(3)+Y overset(Delta)to Cr` (X) and (Y) are :A. Aland CB. C and AlC. C in bothD. Al in both |
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Answer» Correct Answer - b |
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| 72. |
Which of the following statements is correct?A. The rate of reaction cannot be understood from Ellingham diagramB. During the formation of metal oxide `DeltaS` becomes negative and `DeltaG` becomes positive resulting in positive slopeC. There is an brupt change in the slope of Ellingham line when change in phase `(stol)` or `(ltog)` takes placeD. All of the above |
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Answer» Correct Answer - 4 |
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| 73. |
Match list-I with List-II |
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Answer» Correct Answer - `(A)to(p);(B)to(q);(C)to(p,r);(D)to(p,s)` |
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| 74. |
Match list-I with List-II |
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Answer» Correct Answer - `(A)to(p,s);(B)to(p,s);(C)to(q,r);(D)to(q,r)` |
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| 75. |
Match the items of Column I with item of Column II and assign the correct code. A. `{:(,A,B,C,D),(,3,4,2,1):}`B. `{:(,A,B,C,D),(,5,4,3,2):}`C. `{:(,A,B,C,D),(,2,3,4,5):}`D. `{:(,A,B,C,D),(,1,2,3,4):}` |
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Answer» Correct Answer - `Ato3;Bto4;Cto2;Dto1` |
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| 76. |
Match the items of Column I with item of Column II and assign the correct code. A. `{:(,A,B,C,D),(,2,3,4,1):}`B. `{:(,A,B,C,D),(,1,2,3,5):}`C. `{:(,A,B,C,D),(,5,4,3,2):}`D. `{:(,A,B,C,D),(,4,5,3,2):}` |
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Answer» Correct Answer - `Ato2;Bto3;Cto4;Dto1` |
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| 77. |
Match the items of Column I with item of Column II and assign the correct code. A. `{:(,A,B,C,D),(,4,2,3,1):}`B. `{:(,A,B,C,D),(,2,3,1,5):}`C. `{:(,A,B,C,D),(,1,2,3,4):}`D. `{:(,A,B,C,D),(,3,4,5,1):}` |
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Answer» Correct Answer - `Ato4;Bto2;Cto3;Dto1` |
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| 78. |
Match the items of column I with items of column II and assign the correct code. `{:(ColumnI,ColumnII),((A)"Pendulum",(1)"Chrome steel"),((B)"Malachite",(2)"Nickel steel"),((C)"Calamine",(3)Na_(3)AlF_(6)),((D)"Cryolite,(4)CuCO_(3).Cu(OH)_(2)),(,(5)ZnCO_(3)):}`A. `{:(,A,B,C,D),(,1,2,3,4):}`B. `{:(,A,B,C,D),(,2,4,5,3):}`C. `{:(,A,B,C,D),(,2,3,4,5):}`D. `{:(,A,B,C,D),(,4,5,3,2):}` |
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Answer» Correct Answer - `Ato2;Bto4;Cto5;Dto3` |
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| 79. |
Match the items of Column I with items of Column II and assign the correct A. `{:(,A,B,C,D),(,3,4,2,1):}`B. `{:(,A,B,C,D),(,5,4,3,2):}`C. `{:(,A,B,C,D),(,2,3,4,5):}`D. `{:(,A,B,C,D),(,1,2,3,4):}` |
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Answer» Correct Answer - `Ato3;Bto4;Cto2;Dto1` |
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| 80. |
Match the items of Column I with items of Column II and assign the correct A. `{:(,A,B,C,D),(,1,2,4,5):}`B. `{:(,A,B,C,D),(,4,3,1,2):}`C. `{:(,A,B,C,D),(,3,4,2,1):}`D. `{:(,A,B,C,D),(,5,4,3,2):}` |
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Answer» Correct Answer - `Ato4;Bto3;Cto1;Dto2` |
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| 81. |
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 process described above in the passage is regarding:A. ore dressingB. pyrometallurgical extractionC. hydrometallurgical extractionD. purification of metal. |
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Answer» Correct Answer - d |
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| 82. |
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. Which of the following statement is correct?A. Leaching of gold with `CN^(-)` is an oxidation reactionB. Argentite is oxide ore of silverC. In the precipitation of gold from the soluble complex, zinc acts as complexing and reducing agent.D. (A) and ( C) both |
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Answer» Correct Answer - a |
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| 83. |
How many of the following refining processes are correctly matched with their element ? |
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Answer» Correct Answer - 6 |
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| 84. |
How many of the following mimerals are oxides of metals// metalloids . |
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Answer» Correct Answer - 6 |
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| 85. |
How many of the following mimerals are oxides of metals// metalloids . |
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Answer» Correct Answer - 6 |
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| 86. |
Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg. |
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Answer» Correct Answer - 6 |
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| 87. |
How many of following are correctly matched for electrolystic reducing in molten state. |
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Answer» Correct Answer - 5 |
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| 88. |
Extraction of gold and silver involves leaching the metal with `CN^(-)` ion. The metal is recovered by :A. displacement of metal by some other metal from the complex ironB. roasting of metal complexC. Calcination followed by roastingD. thermal decomposition of metal complex |
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Answer» Correct Answer - 1 |
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| 89. |
Extraction of gold and silver involves leaching the metal with `CN^(-)` ion. The metal is recovered by _______A. displacement of metal by some other metal from the complex ironB. roasting of metal complexC. Calcination followed by roastingD. thermal decomposition of metal complex |
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Answer» Correct Answer - 1 |
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| 90. |
During electrolytic reduction of alumina , two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperature of melt in order to making fused mixture very conducting , X and Y are (respectively)A. cryolite and floursparB. cryolite and felsparC. alum and floursparD. flourspar and bauxite |
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Answer» Correct Answer - a |
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| 91. |
For extraction of sodium from `NaC1`, the electrolytic mixture `Nac1+Na_(3)A1F_(6) +Cac1_(2)` is used. During extractions process, only sodium is deposited in cathpode but `K` and `Ca` do not becauseA. Na is more reactive than K and CaB. Na is less reactive than K and CaC. NaCl is less stable than `Na_(3)AIF_(6)` and `CaCl_(2)`D. the discharge potential of `Na^(+)` is less than that of `K^(+)` and `Ca^(+2)` ions |
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Answer» Correct Answer - d |
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| 92. |
The gas `(G_(1))` acts asA. Oxidising agentB. reducing agentC. oxidisting and reducitng agentD. fluxing agent |
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Answer» Correct Answer - d |
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| 93. |
Which of the following statements is correct about[Y] ?A. [Y] is converted to metal (M) by self reduction .B. Carbonate extract of [Y] gives yellow precipiate with suspension of `CdCO_(3)`C. [Y] is chalcocites or chalcopyritesD. All of these |
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Answer» Correct Answer - a |
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| 94. |
During the extraction of Ag and using a KCN solution and Zn, cyanide ions and Zn react with metal ion as respectivelyA. An oxidizing agentB. A lewis acidC. A reducing agentD. A complexing agent |
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Answer» Correct Answer - C::D |
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| 95. |
Which of the following statement is/are not correct?A. All minerals are oresB. Mercury is transported in containers made of iron.C. Calcination is the process of heating the ore strongly in the presence of air.D. Cassiterite is an ore of iron. |
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Answer» Correct Answer - A::C::D |
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| 96. |
Bessemerisation is carried out for: (P) Fe, (Q) Cu,(R )Al, (S) AgA. I,IIB. II,IIIC. III,IVD. I,III |
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Answer» Correct Answer - 1 |
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| 97. |
In the metallurgy of aluminium,A. graphite anode is oxidised to carbon monoxide and carbon dioxideB. oxidation state of oxygen changes in the reaction at anodeC. oxidation state oxygen changes in the overall reaction at anodeD. oxidation state of oxygen changes in the overall reaction involved in the process |
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Answer» Correct Answer - 2 |
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| 98. |
Bessemerization is carried out for (I) Fe (II) Cu (III) Al (IV) silverA. I,IIB. II,IIIC. I,IIID. All |
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Answer» Correct Answer - A |
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| 99. |
Heating mixture of `Cu_(2)O`and `Cu_(2)S` will giveA. `Cu+SO_(2)`B. `Cu+SO_(3)`C. `CuO+CuS`D. `Cu_(2)SO_(3)` |
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Answer» Correct Answer - 1 |
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| 100. |
Heating mixture of `Cu_(2)O` and `Cu_(2)S` will giveA. `Cu_(2)SO_(3)`B. `CuO+CuS`C. `Cu+SO_(3)`D. `Cu + SO_(2)` |
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Answer» Correct Answer - D |
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