Metallurgy PYQs Set 7 (PDF)

Set 7 of 8 · Questions 181-210 of 225

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Metallurgy · Set 7 (Q181-210)
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181. $Purest form of commercial iron is:$ (1) $Wrought iron$ (2) $Cast iron$ (3) $Pig iron$ (4) $Iron scrap + pig iron$ 182. $Hall-Heroult’s process is given by :$ (1) $2Al2O3 + 3C \to 4Al + 3CO2$ (2) $Cu+2 (aq) + H2(g) \to Cu(s) + 2H+(aq)$ (3) $ZnO + C Zn + CO$ (4) $Cr2O3 + 2Al \to Al2O3 + 2Cr$ 183. $Blister copper is$ (1) $impure Cu$ (2) $Cu alloy$ (3) $pure Cu$ (4) $copper having 1% impurity$ 184. $Ellingham diagram is drawn between$ (1) $change in potential of pH$ (2) $change in free energy and oxidation state$ (3) $change in free energy and temperature$ (4) $change in free energy and polarisability$ 185. $Identify the incorrect statement$ (1) $The scientific and technological process used for isolation of the metal from its ore is known as metallurgy$ (2) $Minerals are naturally occurring chemical substances in the earth’s crust$ (3) $Ores are minerals that may contain a metal$ (4) $Gangue is an ore contaminated with undesired materials$ 186. $Cassiterite is an ore of$ (1) $Sb$ (2) $Ni$ (3) $Mn$ (4) $Sn (1999)$ 187. $The method, which is based on the principle that "different components of a mixture are differently adsorbed on an adsorbent" is called$ (1) $zone refining method$ (2) $vapour phase refining method$ (3) $liquation method$ (4) $chromatographic method$ 188. $Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated.The gas X is$ (1) $C O_{2}$ (2) $S O_{3}$ (3) $H_{2} S$ (4) $S O_{2} (NEET2013)$ 189. $The form of iron obtained from blast furnace is :$ (1) $Steel$ (2) $Cast Iron$ (3) $Pig Iron$ (4) $Wrough Iron$ 190. $For the formation of which compound in Ellingham diagram Δ G^{\circ} becomes more and more negative with increase in temperature?$ (1) $CO$ (2) $FeO$ (3) $ZnO$ (4) $Cu_{2} O$ 191. $The role of depressants in Troth Floation method* is to$ (1) $selectively prevent one component of the ore from coming to the froth.$ (2) $reduce the consumption of oil for froth formation.$ (3) $stabilize the froth.$ (4) $enhance non-wettability of the mineral particles.$ 192. $Which one of the following is a mineral of iron ?$ (1) $Malachite$ (2) $Cassiterite$ (3) $Pyrolusite$ (4) $Magnetite$ 193. $The compound(s) that is(are) removed as slag during the extraction of copper is : (1) CaO (2) FeO (3) A 1_{2} O_{3} (4) ZnO (5) NiO Choose the correct answer from the options given below:$ (1) $(3) (4) Only$ (2) $(1), (2), (5) Only$ (3) $(1), (2) Only$ (4) $(2) Only$ 194. $In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with :$ (1) $iron (II) sulphide$ (2) $carbon monoxide$ (3) $copper (I) sulphide$ (4) $sulphur dioxide$ 195. $Which One of the following ores is known as Malachite$ (1) $C u_{2} O$ (2) $C u_{2} S$ (3) $C u F e S_{2}$ (4) $Cu (O H)_{2} . C u C O_{3}$ 196. $The metal extracted by leaching with cyanide is$ (1) $Cu$ (2) $Al$ (3) $Na$ (4) $Ag$ 197. $In the metallurgical extraction of copper, following reaction is used: FeO + S i O_{2} \to F e S i O_{3} FeO and F e S i O_{3} respectively are.$ (1) $gangue and flux$ (2) $flux and slag$ (3) $slag and flux$ (4) $gangue and slag$ 198. $In the equation, 4M + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4(M(CN)_{2})^{-} + 4 O H^{-} Identify the metal (M). 4M + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4(M(CN)_{2})^{-} + 4 O H^{-}$ (1) $Au$ (2) $Fe$ (3) $Zn$ (4) $Cu$ 199. $Among the following, the main reactions occurring in blast furnace during extraction of iron from haematite are (i) Fe_{2} O_{3} + 3 CO ⟶ 2 Fe + 3 CO_{2} (ii) FeO + SiO_{2} ⟶ FeSiO_{3} (iii) Fe_{2} O_{3} + 3 C ⟶ 2 Fe + 3 CO (iv) CaO + SiO_{2} ⟶ CaSiO_{3}$ (1) $(i) and (ii)$ (2) $(iii) and (iv)$ (3) $(ii) and (iii)$ (4) $none of the above$ 200. $In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with :$ (1) $Copper (I) sulphide (Cu2S)$ (2) $Sulphur dioxide (SO2)$ (3) $Iron sulphide (FeS)$ (4) $Carbon monoxide (CO)$ 201. $Which of the following is a carbonate ore?$ (1) $Cuprite$ (2) $Siderite$ (3) $Zincite$ (4) $Bauxite$ 202. $Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?$ (1) $Fe$ (2) $Cu$ (3) $Mg$ (4) $Zn$ 203. $ΔG0 versus T plot in the Ellingham's diagram slopes downward for the reaction$ (1) $C + \frac{1}{2} O2 \to CO$ (2) $CO + \frac{1}{2} O2 \to CO2$ (3) $2Ag + \frac{1}{2} O2 \to Ag2O$ (4) $Mg + \frac{1}{2} O2 \to MgO$ 204. $The reaction representing the Mond process for metal refining is______$ (1) $Ni + 4CONi (C O)_{4}$ (2) $2K [Au (C N)_{2}] + Zn K_{2} [Zn (C N)_{4}] + 2 Au$ (3) $Zr + 2 I_{2} Z r I_{4}$ (4) $ZnO + C Zn + CO$ 205. $Metal with low melting point containing impurities of high melting point can be purified by$ (1) $Zone refining$ (2) $Vapor phase refining$ (3) $Distillation$ (4) $Liquation$ 206. $In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When C O_{2} gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' respectively are :$ (1) $N a A l O_{2} and A l_{2} (C O_{3})_{3} . x H_{2} O$ (2) $Al (O H)_{3} and A l_{2} O_{3} . x H_{2} O$ (3) $Na[Al (O H)_{4}] and A l_{2} O_{3} . x H_{2} O$ (4) $Na[Al (O H)_{4}] and A l_{2} (C O_{3})_{3} . x H_{2} O$ 207. $The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :$ (1) $zone refining$ (2) $vapour phase refining$ (3) $liquation$ (4) $distillation$ 208. $Which one of the following is used to produce Al by electrolysis?$ (1) $Molten Al_{2} O_{3} + Na_{3} AlF_{6} electrolyte, carbon coated steel vessel cathode, graphite anode$ (2) $Al_{2} O_{3} + PbF_{2} electrolyte, steel cathode, graphite anode$ (3) $Molten Al_{2} O_{3} + Na_{3} AlF_{6} electrolyte, graphite cathode, steel anode$ (4) $Al_{2} O_{3} + H_{2} O electrolyte, graphite cathode, steel anode$ 209. $Which of the following element is purified by vapour phase refining?$ (1) $Fe$ (2) $Zr$ (3) $Cu$ (4) $Au$ 210. $From the Ellingham graphs on carbon, which of the following statements is false?$ (1) $CO_{2} is more stable than CO at less than 983 K.$ (2) $CO reduces Fe_{2} O_{3} to Fe at less than 983 K.$ (3) $CO is less stable than CO_{2} at more than 983 K.$ (4) $CO reduces Fe_{2} O_{3} to Fe in the reduction zone of Blast furnace.$