Metallurgy PYQs Set 3 (PDF)

Set 3 of 8 · Questions 61-90 of 225

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions JEE Main Chemistry · Metallurgy · Set 3 (Q61-90)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
61. $How many of the following can be purified by using zone refining method? Ni, B, Ti, In, Ge, Mn, Ag, Si, Ga$ (1) $4$ (2) $5$ (3) $6$ (4) $7$ 62. $Which of the following statement is not correct about Ellingham diagram?$ (1) $ΔG increases with an increases in temperature$ (2) $It consists of plots of ΔfG° vs T for formation of oxides$ (3) $a coupling reaction can be well expressed by this diagram$ (4) $It express the kinetics of the reduction process$ 63. $With respect to an ore, Ellingham diagram helps to predict the feasibility of its$ (1) $Thermal reduction$ (2) $Zone refining$ (3) $Electrolysis$ (4) $Vapour phase refining$ 64. $The methods NOT involved in concentration of ore are (A) Liquation (B) Leaching (C) Electrolysis (D) Hydraulic washing (E) Froth floatation Choose the correct answer from the options giver below :$ (1) $B, D and C only$ (2) $C, D and E only$ (3) $A and C only$ (4) $B, D and E only$ 65. $Refining of impure copper with zinc impurity is to be done by electrolysis using electrodes as : Cathode Anode$ (1) $pure copper pure zinc$ (2) $pure zinc pure copper$ (3) $pure copper impure copper$ (4) $pure zinc impure zinc$ 66. $Which of the following reduction reaction CANNOT be carried out with coke?$ (1) $Al_{2} O_{3} \to Al$ (2) $ZnO \to Zn$ (3) $Fe_{2} O_{3} \to Fe$ (4) $Cu_{2} O \to Cu$ 67. $Assertion: For the extraction of iron, haematite ore is used. Reason: Haematite is a carbonate ore of iron.$ (1) $Only the reason is correct$ (2) $Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion.$ (3) $Both the assertion and reason are correct and thereason is the correct explanation for the assertion.$ (4) $Only the assertion is correct$ 68. $Match the following List I List II (Method) (Metal refined) (A) Zone refining (I) Sn (B) Liquation (II) In(C) Vapour phase (III) Zn refining(D) Distillation (IV) Zr (V) Al The correct answer is$ (1) $A-IV, B-I, C-III, D-V$ (2) $A-II, B-I, C-IV, D-III$ (3) $A-II, B-V, C-III, D-I$ (4) $A-I, B-III, C-IV, D-II$ 69. $Which refining process is generally used in the purification of low melting metals ?$ (1) $Chromatographic method$ (2) $Liquation$ (3) $Electrolysis$ (4) $Zone refining$ 70. $Purification of aluminium, by electrolytic refining, is known as$ (1) $Hoope’s process$ (2) $Bayer’s process$ (3) $Hall’s process$ (4) $Serpeck’s process (1999)$ 71. $Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching ?$ (1) $Argentite$ (2) $Galena$ (3) $Copper pyrite$ (4) $Sphalerite$ 72. $The reaction that does NOT define calcination is:$ (1) $Fe_{2} O_{3} \cdot xH_{2} O ⟶ Δ Fe_{2} O_{3} + xH_{2} O$ (2) $2 Cu_{2} S + 3 O_{2} ⟶ Δ2 Cu_{2} O + 2 SO_{2}$ (3) $ZnCO_{3} ⟶ Δ ZnO + CO_{2}$ (4) $CaCO_{3} \cdot MgCO_{3} ⟶ Δ CaO + MgO + 2 CO_{2}$ 73. $Which of the following is not an ore of magnesium?$ (1) $Carnallite$ (2) $Dolomite$ (3) $Calamine$ (4) $Sea water$ 74. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Aluminium is extracted from bauxite by the electrolysis of molten mixture of A l_{2} O_{3} withcryolite. Reason (R): The oxidation state of Al in cryolite is +3. In the light of the above statements, choose the answer from the options given below :$ (1) $(A) is true but (R) is false.$ (2) $(A) is false but (R) is true.$ (3) $Both (A) and (R) are correct and (R) is the correct explanation of (A).$ (4) $Both (A) and (R) are correct but (R) is not the correct explanation of (A).$ 75. $Which of the following methods are not used to refine any metal? (A) Liquation (B) Calcination (C) Electrolysis (D) Leaching (E) Distillation Choose the correct answer from the options given below:$ (1) $B and D only$ (2) $A, B, D and E only$ (3) $B, D and E only$ (4) $A, C and E only$ 76. $Which of the following are carbonate ores? I. Magnetite II. Kaolinite III. Siderite IV. Calamine$ (1) $I, II, III$ (2) $II, III, IV$ (3) $I, II only$ (4) $III, IV only$ 77. $The process that involves the removal of sulphur from the ores is:$ (1) $Smelting$ (2) $Roasting$ (3) $Leaching$ (4) $Refining$ 78. $The ore that contains the metal in the form of fluoride is:$ (1) $cryolite$ (2) $malachite$ (3) $magnetite$ (4) $sphalerite$ 79. $In metallurgy the term "gangue" is used for:$ (1) $Contamination of undesired earthy materials.$ (2) $Contamination of metals, other than desired metal$ (3) $Minerals which are naturally occuring in pure form$ (4) $Magnetic impurities in an ore.$ 80. $In zone refining method, the molten zone :$ (1) $contains impurities$ (2) $contains purified metal only$ (3) $contains more impurity than the original$ (4) $moves to either side$ 81. $Identify the metal which is not common to German silver and brass.$ (1) $Cu$ (2) $Zn$ (3) $Fe$ (4) $Ni$ 82. $The Mo nd process is used for the:$ (1) $purification of Ni$ (2) $extraction of Mo$ (3) $purification of Zr and Ti$ (4) $extraction of Zn$ 83. $Which of the following is not a mineral of fluorine?$ (1) $Fluorspar$ (2) $Cryolite$ (3) $Fluoroapatite$ (4) $Carnallite$ 84. $In the isolation of metals, reaction process usually results in :$ (1) $Metal sulphide$ (2) $metal carbonate$ (3) $metal hydroxide$ (4) $metal oxide$ 85. $Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is (are):$ (1) $Impure Cu strip is used as cathode$ (2) $Acidified aqueous C u S O_{4} is used as electrolyte$ (3) $Pure Cu deposits at cathode$ (4) $Impurities settle as anode-mud$ 86. $What is the slag formed during the extraction of iron?$ (1) $MgO$ (2) $FeSiO_{3}$ (3) $CaSiO_{3}$ (4) $MgSiO_{3}$ 87. $Which of the following ore is concentrated using group 1 cyanide salt?$ (1) $Sphalerite$ (2) $Siderite$ (3) $Malachite$ (4) $Calamine$ 88. $Considering Ellingham diagram, which of the following metals can be used to reduce alumina?$ (1) $Fe$ (2) $Zn$ (3) $Mg$ (4) $Cu(NEET2018)$ 89. $The purification method based on the following physical transformation is: Solid (X) Heat Vapour (X) Cool Solid (X)$ (1) $Extraction$ (2) $Crystallization$ (3) $Distillation$ (4) $Sublimation$ 90. $Oxidation states of the metal in the minerals haematite and magnetite, respectively, are$ (1) $II, III in haematite and III in magnetite$ (2) $II, III in haematite and II in magnetite$ (3) $II in haematite and II, III in magnetite$ (4) $III in haematite and II, III in magnetite$