Metallurgy PYQs Set 6 (PDF)

Set 6 of 8 · Questions 151-180 of 225

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Metallurgy · Set 6 (Q151-180)
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151. $Oxidation state of copper is +1 in$ (1) $malachite$ (2) $cuprite$ (3) $azurite$ (4) $none of the above$ 152. $The one that is not a carbonate ore is:$ (1) $malachite$ (2) $calamine$ (3) $siderite$ (4) $bauxite$ 153. $In the electrolytic refining of zinc,$ (1) $graphite is at the anode$ (2) $the impure metal is at the cathode$ (3) $the metal ion gets reduced at the anode$ (4) $acidified zinc sulphate is the electrolyte.$ 154. $The correct statement is:$ (1) $aniline is a froth stabilizer.$ (2) $zincite is a carbonate ore$ (3) $sodium cyanide cannot be used in the metallurgy of silver.$ (4) $zone refining process is used for the refining of titanium.$ 155. $Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of :$ (1) $Al2O3 + HF + NaAlF4$ (2) $Al2O3 + CaF2 + NaAlF4$ (3) $Al2O3 + Na3AlF6 + CaF2$ (4) $Al2O3 + KF + Na3AlF6$ 156. $In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with :$ (1) $S O_{2}$ (2) $F e_{2} O_{3}$ (3) $C u_{2} O$ (4) $CO$ 157. $Boron and silicon of very high purity can be obtained through$ (1) $vapour phase refining$ (2) $electrolytic refining$ (3) $liquation$ (4) $zone refining$ 158. $In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with$ (1) $carbon monoxide$ (2) $copper (I) sulphide$ (3) $sulphur dioxide$ (4) $iron (II) sulphide.$ 159. $During the process of electro-refining of copper some metals present as impurity settle as anode mud. These are :$ (1) $Sn and Ag$ (2) $Pb and Zn$ (3) $Ag and Au$ (4) $Fe and Ni$ 160. $Calamine and Malachite, respectively, are the ores of :$ (1) $Nickel and Aluminium$ (2) $Zinc and Copper$ (3) $Copper and Iron$ (4) $Aluminium and Zinc$ 161. $The metal that can be purified economically by fractional distillation method is:$ (1) $Fe$ (2) $Zn$ (3) $Cu$ (4) $Ni$ 162. $Which of the following pairs of metals is purified by van Arkel method ?$ (1) $Ga and Ιn$ (2) $Zr and Ti$ (3) $Ag and Au$ (4) $Ni and Fe$ 163. $Which ofthe following pairs ofmetals is purified by van Arkel method?$ (1) $Ga and In$ (2) $Zr and Ti$ (3) $Ag and Au$ (4) $Ni and Fe(2011)$ 164. $Given below are two statements : Statement I : According to the Ellingham diagram, any metal oxide with higher ∆ G^{0} is more stable than the one with lower ∆ G^{0} . Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Both Statement I and Statement II are correct.$ (2) $Both Statement I and Statement II are incorrect$ (3) $Statement I is correct but Statement II is incorrect.$ (4) $Statement I is incorrect but Statement II is correct.$ 165. $Which one of the following is a mineral of iron?$ (1) $Malachite$ (2) $Cassiterite$ (3) $Pyrolusite$ (4) $Magnetite(2012)$ 166. $Which one is malachite from the following$ (1) $C u C O_{3} .Cu (O H)_{2}$ (2) $C u F e S_{2}$ (3) $Cu (O H)_{2}$ (4) $F e_{3} O_{4}$ 167. $Which one of the following statements is incorrect ?$ (1) $Boron and Indium can be purified by zone refining method.$ (2) $Van- Arkel method is used to purify tungsten.$ (3) $Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.$ (4) $The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.$ 168. $The major components in "Gun Metal" are:$ (1) $Al, Cu, Mg and Mn$ (2) $Cu, Sn and Zn$ (3) $Cu, Zn and Ni$ (4) $Cu, Ni and Fe$ 169. $The method of zone refining of metals is based on the principle of$ (1) $greater mobility of the pure metal than that of the impurity$ (2) $higher melting point of the impurity than that of the pure metal$ (3) $greater noble character of the solid metal than that of the impurity$ (4) $greater solubility of the impurity in the molten state than in the solid.$ 170. $The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.$ (1) $F e_{2} O_{3 (s)} + 3 C O_{(g)} \to 2 F e_{(l)} + 3 C O_{2 (g)}$ (2) $C a C O_{3 (s)} \to C a O_{(s)} + C O_{2 (g)}$ (3) $C a O_{(s)} + S i O_{2 (s)} \to C a S i O_{3 (s)}$ (4) $2 C_{(s)} + O_{2 (g)} \to 2 C O_{(g)} (Mains2011)$ 171. $The element that can be refined by distillation is$ (1) $gallium$ (2) $nickel$ (3) $zinc$ (4) $tin$ 172. $Which of the reaction is suitable for concentrating ore by leaching process ?$ (1) $2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$ (2) $F e_{3} O_{4} + CO \to 3FeO + C O_{2}$ (3) $A 1_{2} O_{3} + 2NaOH + 3 H_{2} O \to 2Na[A1 (O H)_{4}$ (4) $A 1_{2} O_{3} + 6Mg \to 6MgO + 4A1$ 173. $The method used for the purification of Indium is :$ (1) $van Arkel method$ (2) $vapour phase refining$ (3) $zone refining$ (4) $Liquation$ 174. $The metal that is not extracted from its sulphide ore is :$ (1) $Aluminium$ (2) $Iron$ (3) $Lead$ (4) $Zinc$ 175. $Which of the following taking place in the Blast furnace is endothermic?$ (1) $CaCO_{3} \to CaO + CO_{2}$ (2) $2 C + O_{2} \to 2 CO$ (3) $C + O_{2} \to CO_{2}$ (4) $Fe_{2} O_{3} + 3 CO \to 2 Fe + 3 CO_{2}$ 176. $The metal purified by Mond process is X and metal purified by van Arkel method is Y . X and Y respectively are$ (1) $Ni, Zr$ (2) $Mn, Ti$ (3) $Zr, Ti$ (4) $Ni, Cu$ 177. $In the extraction of copper from its sulphide ore, the metal is formed by reduction of Cu2O with$ (1) $FeS$ (2) $CO$ (3) $Cu2S$ (4) $SO2$ 178. $According to the following diagram, A reduces B O_{2} when the temperature is :$ (1) $< 1200ºC$ (2) $> 1200ºC but < 1400ºC$ (3) $< 1400ºC$ (4) $> 1400ºC$ 179. $Heating mixture of Cu2O and Cu2S will give :$ (1) $Cu2SO3$ (2) $CuO + CuS$ (3) $Cu + SO3$ (4) $Cu + SO2$ 180. $In the electrolytic refining of blister copper, the total number of main impurities, from the following, removedas anode mud is ____Pb, Sb, Se,Te,Ru,Ag,Au and Pt$