JEE Main & Advanced Chemistry Organic Chemistry: Some Basic Principles & Techniques / कार्बनिक रसायन : कुछ मूलभूत सिद्धांत एवं तकन Question Bank

done Mock Test - General Principles Processes of Isolation of Elements Total Questions - 25

• question_answer1)
  Which of the following statements is true?
  A)
  Reduction of a metal oxide is easier if the metal formed is in liquid state at reduction temperature done clear
  B)
  Reduction of metal oxide is normally less feasible at high temperature done clear
  C)
  The oxidation of CO into \[C{{O}_{2}}\] will have a negative slope on Ellingham diagram done clear
  D)
  The reactive metals have positive slope for oxidation on Ellingham diagram whereas non-reactive metals have a negative slope done clear
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• question_answer2)
  The main reaction occurring in blast furnace during the extraction of iron from haematite is
  A)
  \[F{{e}_{2}}{{O}_{3}}+3C\to 2Fe+3CO\] done clear
  B)
  \[FeO+Si{{O}_{2}}\to FeSi{{O}_{3}}\] done clear
  C)
  \[F{{e}_{2}}{{O}_{3}}+3CO\to 2Fe+3C{{O}_{2}}\] done clear
  D)
  \[CaO+Si{{O}_{2}}\to CaSi{{O}_{3}}\] done clear
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• question_answer3)
  Flux is often added to remove impurities from an iron ore in a blast furnace. In the reactions slag and flux are
  A)
  \[CaSi{{O}_{3}}\] and \[Si{{O}_{2}}\] done clear
  B)
  \[CaO\] and \[Si{{O}_{3}}\] done clear
  C)
  \[CaSi{{O}_{3}}\] and \[CaO\] done clear
  D)
  \[Si{{O}_{2}}\] and \[CaSi{{O}_{3}}\] done clear
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• question_answer4)
  Which one of the following ores is concentrated by chemical leaching method?
  A)
  Argentite            done clear
  B)
  Copper pyrite done clear
  C)
  Cinnabar           done clear
  D)
  Galena done clear
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• question_answer5)
  Wolframite (\[FeW{{O}_{4}}\]) impurities present in cassiterite (\[Sn{{O}_{2}}\]) can be separated by the process of
  A)
  froth floatation done clear
  B)
  zone refining done clear
  C)
  electromagnetic separation done clear
  D)
  gravity separation done clear
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• question_answer6)
  Annealing of steel is the process of heating steel
  A)
  to a bright red hot and then cooling it slowly done clear
  B)
  to a bright red hot and then cooling it suddenly done clear
  C)
  to a temperature much below redness and cooling it slowly done clear
  D)
  none of the above done clear
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• question_answer7)
  Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by leaching?
  A)
  Sphalerite          done clear
  B)
  Galena done clear
  C)
  Argentite            done clear
  D)
  Copper pyrites done clear
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• question_answer8)
  Poling process is used
  A)
  for the removal of \[C{{u}_{2}}O\] from Cu done clear
  B)
  for the removal of \[A{{l}_{2}}{{O}_{3}}\] from Al done clear
  C)
  for the removal of \[F{{e}_{2}}{{O}_{3}}\] from Fe done clear
  D)
  In all the above done clear
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• question_answer9)
  Zone refining is based on the principle that..........
  A)
  impurities of low boiling metals can be separated  distillation done clear
  B)
  impurities are more soluble in molten metal than in solid metal done clear
  C)
  different components of a mixture are differently adsorbed on an adsorbent. done clear
  D)
  vapour of volatile compound can be decomposed in pure metal. done clear
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• question_answer10)
  In which of the following pair of metals, both are commercially extracted from their respective ores by self- reduction method?
  A)
  Zn, Cu   done clear
  B)
  Pb, Cu done clear
  C)
  Sn, Zn   done clear
  D)
  Al, Ag done clear
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• question_answer11)
  In zone refining, pure metal is obtained at the
  A)
  Right end, if zone is travelling from left to right done clear
  B)
  Left end, if zone is travelling from left to right done clear
  C)
  Left end, if zone is travelling from right to left done clear
  D)
  Centre, if zone is travelling from any side done clear
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• question_answer12)
  Copper matte is extracted from copper pyrites ore b) heating it in blast furnace. The method is based on the principle that:
  A)
  copper has more affinity for oxygen than sulphur at high temperature done clear
  B)
  iron has less affinity for oxygen than sulphur at high temperature done clear
  C)
  sulphur has less affinity for oxygen at high temperatun done clear
  D)
  copper has less affinity for oxygen than sulphur at high temperature done clear
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• question_answer13)
  During the extraction of gold the following reactions take place \[Au+C{{N}^{-}}+{{H}_{2}}O\xrightarrow{{{o}_{2}}}X,\,X+Zn\to Y+Au\] Here, X and Y respectively are
  A)
  \[{{\left[ Au(C{{N}_{4}}) \right]}^{3-}}\] and \[{{\left[ Zn{{(CN)}_{4}} \right]}^{2-}}\] done clear
  B)
  \[{{\left[ Au(C{{N}_{2}}) \right]}^{-}}\] and \[{{\left[ Zn{{(CN)}_{6}} \right]}^{4-}}\] done clear
  C)
  \[{{\left[ Au(C{{N}_{4}}) \right]}^{4-}}\]and \[{{\left[ Zn{{(CN)}_{4}} \right]}^{2}}\] done clear
  D)
  \[{{\left[ Au(C{{N}_{4}}) \right]}^{4-}}\] and \[{{\left[ Zn{{(CN)}_{4}} \right]}^{2-}}\] done clear
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• question_answer14)
  Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron?
  A)
  The slag is lighter and has lower melting point than the metal done clear
  B)
  The slag is heavier and has lower melting point than the metal done clear
  C)
  The slag is lighter and has higher melting point than the metal done clear
  D)
  The slag is heavier and has higher melting point than the metal done clear
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• question_answer15)
  Consider the following reactions at\[1000{}^\circ C\]. \[Zn(s)+\frac{1}{2}{{O}_{2}}(g)\to ZnO(g);\,\Delta {{G}^{o}}=-360\,kJ/mol\] \[C(s)+\frac{1}{2}{{O}_{2}}(g)\to CO(g);\,\Delta {{G}^{o}}=-400\,kJ/mol\] Choose the correct statement at \[1000{}^\circ C\].
  A)
  Zinc can be oxidized by CO done clear
  B)
  Zinc oxide can be reduced by C done clear
  C)
  Both statements [a] and [b] are true done clear
  D)
  Both statements [a] and [b] are false done clear
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• question_answer16)
  In aluminum extraction by the Bayer's process, alumina is extracted from bauxite by sodium hydroxide at high temperature and pressures. \[A{{l}_{2}}{{O}_{3}}(s)+2O{{H}^{-}}(aq)\to 2A{{l}^{-}}_{2}(aq)+{{H}_{2}}O(\ell )\] Solid impurities such as \[F{{e}_{2}}{{O}_{3}}\] and \[Si{{O}_{2}}\] are removed and then Al\[{{(OH)}^{-}}_{4}\] is reprecipitated. \[Al{{(OH)}^{-}}_{4}\to A{{l}_{2}}{{O}_{3}}\cdot 2{{H}_{2}}O(s)+2O{{H}^{-}}(aq)\] In the industrial world
  A)
  carbon dioxide is added to precipitate the alumina done clear
  B)
  Temperature and pressure are dropped and the super- saturated solution is seeded done clear
  C)
  both [a] and [b] are practiced done clear
  D)
  the water is evaporated. done clear
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• question_answer17)
  Roasting of sulphides gives the gas X as a by-product. This is a colorless gas produce choking smell of burnt sulphur, and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic and acts as a reducing agent and it has never been isolated. The gas X is
  A)
  \[S{{O}_{2}}\]  done clear
  B)
  \[C{{O}_{2}}\] done clear
  C)
  \[S{{O}_{3}}\]              done clear
  D)
  \[{{H}_{2}}S\] done clear
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• question_answer18)
  In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
  A)
  CO and \[C{{O}_{2}}\] are produced in this process done clear
  B)
  \[A{{l}_{2}}{{O}_{3}}\] is mixed with \[Ca{{F}_{2}}\] which lowers the melting point of the mixture and brings conductivity done clear
  C)
  \[A{{l}^{3+}}\] is reduced at the cathode to form Al done clear
  D)
  \[N{{a}_{3}}AI{{F}_{6}}\] Serves as the electrolyte done clear
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• question_answer19)
  Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
  A)
  II, III in haematite and III in magnetite done clear
  B)
  II, III in haematite and II in magnetite done clear
  C)
  II in haematite and II, III in magnetite done clear
  D)
  III in the haematite and II, III in magnetite done clear
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• question_answer20)
  Which series of reactions correctly chemical reactions related to iron and its compound
  A)
  \[Fe\xrightarrow{C{{l}_{2}},\,heat}FeC{{l}_{2}}\xrightarrow{heat,air}FeC{{l}_{2}}\xrightarrow{Zn}Fe\] done clear
  B)
  \[Fe\xrightarrow{{{O}_{2}},\,heat}F{{e}_{2}}{{O}_{4}}\xrightarrow{CO,{{600}^{0}}C}FeC{{l}_{3}}\xrightarrow{CO,{{700}^{0}}C}Fe\] done clear
  C)
  \[Fe\xrightarrow{dil,{{H}_{2}}S{{O}_{4}}}Fe{{O}_{4}}\xrightarrow{{{H}_{2}}S{{O}_{4}},{{O}_{2}}}Fe{{(S{{O}_{4}})}_{3}}\xrightarrow{heat}Fe\] done clear
  D)
  \[Fe\xrightarrow{{{O}_{2}},heat}FeO\xrightarrow{dil,{{H}_{2}}S{{O}_{4}}}FeS{{O}_{4}}\xrightarrow{heat}Fe\] done clear
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• question_answer21)
  Number of ores that have more than one metal or non-metal among: Horn silver, Quick silver, chromite, limonite, cinnabar, cryolite, caliche, diaspora, fluorspar.
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• question_answer22)
  How many metallic ores are concentrated by magnetic separation method from the given ores? Cassiterite, pyrolusite, rutile, magnetite, galena, cinnabar.
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• question_answer23)
  \[C{{u}^{2+}}+Fe\to Cu+F{{e}^{2+}}\] for this reaction to calculate \[\Delta G{}^\circ \] the formula \[\Delta G{}^\circ =-n\,FE{}^\circ \]is used. Find the value of n.
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• question_answer24)
  Find the number of acidic flux from the given compounds: \[CaC{{O}_{3}},N{{a}_{2}}{{B}_{4}}{{P}_{7}},MgSi{{O}_{3}},FeSi{{O}_{3}},{{P}_{2}}{{O}_{5}}\]
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• question_answer25)
  Ti is purified by following method: \[\text{Impure}\,\,\text{metal}\,+{{I}_{2}}\xrightarrow{\Delta }Ti\,{{I}_{x}}\] \[Vapours\,\xrightarrow[at\,\,high\,temp]{Heating}Pure\,metal\,+{{I}_{2}}\] What is the value of x?
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