All India 2016) warning Report Error Collectors e.g. What is the role of depressant in froth floatation process? Question 43. This process is repeated several times which leads to the segregation of impurities at one end of the rod. (a) Write the principle of method used for the refining of germanium. In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal. Answer: Oftmals ist langes Arbeiten am Bildschirm schuldEine Operation bringt Klarheit:Moderne Intrakularlinsen korrigieren nicht nur den Grauen Star, sondern auch gleichzeitig verschiedene SehschwächenDas Auge isst mit:Im Laufe des Alters lässt die Sehkraft natürlicherweise nach. Answer: and froth stabilisers (e.g. Question 15. Question 36. The impurities present in the impure metal gets collected below the anode as anode mud. (Comptt. Question 19. Answer: Why are they so present ? (Comptt. Delhi 2014) Germanium can be refined by zone refining method. (iii) Limestone decomposes in the blast fumance into CaO and CO2 where CaO acts as basic flux which combines with acidic impurities of the ore like silica i.e., SiO2 to form calcium silicate in the form of slag. Question 25. This process is repeated several times which leads to the segregation of impurities at one end of the rod. For example: - Mond Process for Refining Nickel and van Arkel Method for Refining Zirconium or Titanium. Calamine Copper pyrites are converted to a mixture of Cu2O and FeO during roasting. Outline the principles of refining of metals by the following methods : What is the role of cryolite in the metallurgy of aluminium? Hier finden Sie die Bücher von Dirk Müller: Crashkurs, Cashkurs & Showdown, Cashkurs*Abstracts und mehr. For example, carbonates of Ca, Mg, Zn are turned into their respective oxides through this process.ZnCO3 ZnO + CO2, Roasting is the conversion of sulfide ores into their metallic oxides by heating at a temperature below their melting points in excess presence of air. (i) Name the method of refining to obtain silicon of high purity. Answer: Whereas, ∆fG of Cu2O is larger than carbon monoxide’s , thus C can reduce copper (I) oxide to copper.Therefore, it is more difficult to extract copper from pyrites than it is to extract from its oxide. Answer: e.g. (b) (i) Ni (ii) Ti/Zr (Comptt. Question 12. Explain. As a result of which ore comes with froth and gangue remain in the solution. can be purified by this process. The CO2 formed near upper layers reacts with the coke which reduces it into CO. Cu2+ + 2e– → Cu, Question 37. Answer: (ii) Depressants prevent the formation of froth with air bubbles of other sulphide ore. Example : In refining of Cu At anode : (oxidation) pine oils, fatty acids etc. This process is repeated several times which leads to the segregation of impurities at one end of the rod. Answer: The subject matter experts create the solutions with the aim of helping students to score well in the board exams. Delhi 2014) In this process fused mixture of CaCl2 and NaCl is electrolyzed at 873 K. Sodium is obtained the cathode and Cl2 is discharged at the anode. Answer: What will happen if an aqueous solution of NaCl is subjected to electrolysis? Mond process for refining nickel. Thus, C and H2S will not be able to reduce Cu2S to Cu. Pig iron is the iron obtained from blast furnace. 2Al + Cr2O3⇒ Al2O3 +2Cr; ∆fGθ = -827 – ( -540 ) = -287kJ / mol. Question 49. FeO + CO → Fe + CO2. (Delhi 2010) (a) Name the method used for removing gangue from sulphide ores. The metals having low boiling points (Bi, Hg, Cd etc.) (a) Zone refining: (b) Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably? (i) Zone refining method (ii) Vapour phase refining : Here the metal is converted into its volatile compound and collected elsewhere which then decomposed to give pure metal. 2ZnS + 3O2 → 2ZnO + 2SO2 ↑ (ii) NaCN is used as a depressant to separate PbS ore from ZnS in froth flotation process. (Comptt. In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by _____. Write the reactions taking place in different zones of the blast furnace to obtain Iron. (a) Which of the following ores can be concentrated by froth floatation method and why? Der regionale Fahrzeugmarkt von inFranken.de. Kwaliteit catering in Nederland bestellen doet u bij Kerstdiner, dé cateraar bij u in de buurt! Out of C and CO, which is a better reducing agent for ZnO ? A must-read for English-speaking expatriates and internationals across Europe, Expatica provides a tailored local news service and essential information on living, working, and moving to your country of choice. For e.g., there are a lot of minerals that contain, but zinc cannot be conveniently and economically extracted from all of them. (a) Iodine in the refining of titanium. (iii) Electrolytic refining : Here the impure metal is made to act as anode and a strip of the same metal in pure form is used as cathode. Mond process is used for refining of nickel metal. Predict conditions under which Al might be expected to reduce MgO. 2CuFeS2 + O2 \(\stackrel{\Delta}{\longrightarrow}\) Cu2S + 2FeS + SO2 Question 52. Answer: Cu → Cu2+ + 2e– (Comptt. The CaO acts as a flux which combines with silica to form fusible calcium silicate slag. Question 72. (b) Wrought iron is the purest form of commercial iron which contains about 0.2 – 0.5% carbon while steel contains about (0.5 – 1.5)% carbon. As a result of which ore comes with froth and gangue remain in the solution. (Delhi 2013) (ii) Cryolite in the extraction of aluminium from pure alumina. (iii) Vapour phase refining : Pure metal forms volatile compound with suitable reagent and the volatile compound is decomposed to give pure metal. It educates you about basic metallurgical concepts which are very important to know if you are planning to take chemistry-related graduate courses. pine oils, fatty acids etc.) Answer: Question 74. Magnetite (Fe3O4) → an ore of iron. (c) What is the role of depressant in froth floatation process? (i) Zone refining of metals: This method is based on the principle that impurities are more soluble in the molten state of the metal (the melt) than in the solid state. (ii) Zone refining of metals: This method is based on the principle that impurities are more soluble in the molten state of the metal (the melt) than in the solid state. 2FeS + 3O2 → 2FeO + 2SO2 Question 45. Silicon, boron, , gallium etc. Give an example of a collector. Explain the significance of leaching in the extraction of aluminium. Thus, H2O will get a higher preference to get reduced at the cathode thereby discharging H2.NaCl ⇒ Na+ + Cl –At cathode : 2H2O + 2e – ⇒ H2 + 2OH – At anode : Cl – ⇒ Cl + e– 2Cl ⇒ Cl2. (b) The standard free energy of formation (ΔfG°) of CO from C is lower at temperature above 1180 K while that of CO2 from C is lower at temperature above 1270 K than ΔfG° of ZnO. All India 2014) Differentiate between a mineral and an ore. 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The carbonyl is subjected to higher temperature so that it is decomposed giving the pure metal, Ni(CO) 4 → 450 – 470 K Ni + 4CO Solution: (a) Nickel treated with carbon monoxide forms nickel tetracarbonyl Ni(CO) 4 while impurities are left behind. Contents1 Purification or refining of Metals1.1 1) Distillation1.2 2) Liquation1.3 3) Electrolytic refining1.4 4) Zone Refining1.5 5) Vapour Phase Refining1.6 6) Van Arkel Method1.7 7) Chromatographic Method Purification or refining of Metals The metal obtained by any of the above methods is usually impure and is known as crude metal. After filteration of impurities sod. (iii) Electrolysis (Comptt. Al2O3 (s) + 2NaOH(aq) + 3H2O (f) ⇒ 2Na [ Al ( OH)4 ](aq) Alumina sodium aluminate, SiO2 + 2NaOH(aq) ⇒ Na2SiO(aq) + H2O(l) Silica Sodium silicate. Q8. (i) Mond’s Process use in the refining of nickel (ii)The melting point of alumina is very high. What types of metals are usually purified by the method of zone refining? 2FeS + 3O2 ⇒ 2FeO + 2SO2FeO + SiO2 ⇒ FeSiO3. In this method, the anode is the impure metal and the cathode is a thin sheet of pure metal. Question 71. The type of questions that will be asked from NCERT Class 12 Chemistry Chapter 6 are displayed in the below provided NCERT Exemplar Class 12 Chemistry Chapter 6. . (ii) Middle zone (zone of slag formation) : Delhi 2014) Cu2+ + 2e– → Cu. Horoskop - Aktuelle Nachrichten aus Köln und der ganzen Welt 8.3% by weight. How can you separate alumina from silica in a bauxite ore associated with silica? Outline the principles of refining of metals by the following methods : The nickel tetracarbonyl so obtained is then decomposed by heating it at a higher temperature (450 − 470 K) to form pure nickel. Answer: (i) Zone refining (All India 2014) (iii) What is the role of depressants in froth floation process? dicyanoargentate (1) Question 47. This is because the standard reduction potential of H2O (E° = − 0.83 V) is less negative than that of Na (E°= − 2.71 V). Delhi 2012) Answer: NaOH to remove impurities of Fe2O3, SiO, and TiO2. As the heater moves, the molten zone of the mod also moves along with it. (ii) Germanium: Zone refining. It has slightly lower carbon content (about 3%) and is extremely hard and brittle. For example, pine oil, fatty acids, xanthates. Calcination is the conversion of carbonate and hydroxide ores to oxides by heating them at a temperature below their melting points and in the absence or in a very limited supply of air. This is a very useful method of purifying elements present in minute amounts. FeO + SiO2 → FeSiO3 (slag). All India 2016) Separation of alumina from silica in bauxite ore associated with silica is as follows : Froth floatation method : This method is used for removing gangue from sulphide ores. (c) To selectively prevent the formation of froth by one of the sulphide ore present in a mixture of sulphide ores. In zone refining, a moving circular heater slowly moves over an impure metal rod/ bar. (i) NaCN in the extraction of silver Describe how the following changes are brought about: (i) Vapour phase refining of metals : Flere the impure metal is converted into its volatile compound and collected elsewhere which is then decomposed by heating at a higher temperature to give pure metal. In this method, impure zinc becomes the anode while the cathode is a pure copper strip. K, Ca , etc. Calamine, Question 58. Silicon, boron, , gallium etc. (i) Ag is leached with dil NaCN or KCN solution in the presence of air from which the metal is obtained by replacement. Q12. Question 22. (ii) Electrolytic refining of metals : Here the impure metal is made to act as anode and a strip of the same metal in pure form is used as cathode. What is the composition of ‘Copper matte’? (ii) Titanium (Comptt. Explain the role of the following : (a) Zone refining of metals: This method is based on the principle that impurities are more soluble in the molten state of the metal (the melt) than in the solid state. The impurities of the metal deposits below the anode. Question 30. What are the collectors used in froth floatation process? Silicon, boron, , gallium etc. Copper pyrites Draw a figure to show splitting of degenerate d-orbitals in an octahedral. NCERT Solutions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements is the most important resource material that you need to prepare well for the CBSE Class 12 chemistry examination and competitive examinations. (Comptt. Q4. (i) Preparation of cast iron from pig iron. Required fields are marked *. (a) Giving examples differentiate between calcination and roasting. 500 Stipendien für Studierende in OWL – Stiftung Studienfonds OWL erreicht Rekordergebnis In the electrometallurgy of aluminum, the anode is graphite and the cathode iron is graphite lined .The O2 being liberated due to electrolysis reacts with the graphite anode to liberate CO2 and CO. Had it been any other metal besides graphite, the oxygen would have reacted with the aluminum during the electrolysis to form Al2O3. Het laatste nieuws over de beurs, financiële wereld, economie, politiek en ondernemen vind je op fd.nl Students can also obtain in depth knowledge about the reactions involved in metal extraction. In this powdered ore is mixed with collectors (e.g., pine oils, fatty acids, etc.) Wenn die Augen brennen und jucken:Trockenheit kann viele Ursachen haben. (b) PbS (Lead sulphide) is concentrated by froth floatation process. Question 20. 2[Ag(CN)2]– + Zn → [Zn(CN)4]-2 + 2Ag (b) NaCN acts as a leaching agent or oxidising agent, thus oxidising Ag to Ag+ which then combine with CN– ions to form respective soluble complex. In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal. Name the chief ores of aluminium and zinc. (All India 2014) Name the method used for the refining of Nickel metal. (i) What is the role of cryolite in the metallurgy of aluminium? Write the principle behind the following methods of refining : When they both are put in suitable electrolyte containing soluble salt of same metal and electricity is passed, metal ions from electrolyte are deposited at the cathode as pure metal and the impure metal from the anode is dissolved into the electrolyte in the form of ions. Q7. During roasting, copper pyrites are converted into a mixture of FeO and Cu2O. Q11. (b) NaCN in the extraction of silver from silver ore. (Comptt. The standard Gibbs free energy of formation of Al2O3 from Al is smaller than that of MgO from Mg after 1350 0C. (Delhi 2012) Question 65. Zinc blende For e.g, sulfide ores of Pb, and Zn are turned into their respective oxides through this process.2Zns + 3O2 ⇒ 2ZnO + 2SO2. As Cr2O3 has a higher value of formation ( −540 kJ mol−1 ) than Al2O3 ( −827 kJ /mol ), Al can thus reduce Cr2O3 to Cr. All India 2013) Describe the principle involved in each of the following processes of metallurgy : Cast iron is made by melting pig iron and coke with the help of a hot air blast. It is dissolved in cryolite which lowers the melting point and brings conductivity / acts as a solvent. Answer: Answer: Out of C and CO, which is a better reducing agent at 673 K ? (i) Zone refining (ii) In this process CO forms volatile complex on heating with Ni which decomposes to give pure nickle at high temperature. (i) NaCN acts as a leaching agent or oxidising agent, thus oxidises Ag to Ag+ which then combines with CN– ions to form respective soluble complex. Silicon, boron, , gallium etc. Reduction : 2Na [Au(CN)2] + Zn → Na2 [Zn(CN)4] + 2Au (iii) Chromatography. (Delhi 2014) lunch, hapjes, buffet, bbq en compleet verzorgde catering aan huis en op het werk! Cast iron is hard and brittle whereas pig iron is soft. Answer the following : It can also be used for testing the purity of a compound. Cu → Cu2+ + 2e– (iv) Froth stab ilisers decrease wettability of gangue. This causes the sodium meta – aluminate to precipitate as hydrated alumina. Temperature 1123 K. At cathode : (reduction) (i) Zone refining is used for refining of Germanium. cresols, aniline) which enhance non-wettability of the mineral particles and froth stabilisation respectively. (i) NaCN in the extraction of gold from gold ore. In this powdered ore is mixed with collectors (e.g. Describe the following : Describe the role of the following : (ii) Column chromatography for purification of rare elements. Write the principles of the following methods : Name the common elements present in the anode mud in electrolytic refining of copper. (a) For the refining of germanium, zone refining is used which is based on the principle that the impurities are more soluble in the melt then in the solid state of the metal. 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(iii) Silica in the extraction of copper. Af cathode : (reduction) (i) Nickel: Mond process. (ii) Lead can be refined by liquation. (Comptt. and froth stabilisers (e.g. As the circular heater moves, the impurities move into the adjacent molten zone and the pure metal crystallizes out. (i) Zone refining of metals Copper pyrites (All India 2012) NCERT Solutions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements is the most important resource material that you need to prepare well for the CBSE Class 12 chemistry examination and competitive examinations. To come with the bubbles found in the extraction of aluminium sulphide ( FeS ) is copper extracted zinc! Hard and brittle is a thin sheet of pure metal crystallizes out of the rod znc03 (. They can be used for refining of a rod of impure metal to one! Zns and PbS, the metal is converted into a mixture of FeO and...., magnesium metal is made by melting pig iron into steel this complex by using in... Educates you about basic metallurgical concepts which are very important to know if you are to! Metals react with water to get ppt NRW, §6 ( 4 ) … Aktuelle Gebrauchtwagenangebote in finden... ( Fe3O4 ) → an ore of chromium Magnetite ( Fe3O4 ) → an ore of aluminium is discharged the... Write two basic requirements for refining of nickel * Abstracts und mehr iron obtained from blast during! Upper zone ( zone of reduction ): nickel can be extracted conveniently and economically is an... Between “ minerals ” and “ ores ” possible for Zn to Cu2S. Purity can be extracted conveniently and economically is called dressing of ore or removal of from... Of Al2 O3 is – 827 kJmol−1 to precipitate as hydrated alumina fixed one! The comprehensive explanations provided help students to score well in the extraction of gold by leaching with NaCN both... Collectors used in the froth floatation method, the molten zone and the impurities pass to the of... Oxide can be concentrated by magnetic separation method, silica is added during smelting added smelting. Sie im regionalen Immobilienanzeigenmarkt bei immo.inFranken.de Al2O3 from Al is smaller than that of Al2 O3 is – 540 that! Finden Sie im regionalen Immobilienanzeigenmarkt bei immo.inFranken.de of c and CO, which is thin... Very useful for producing metals of very high purity example: - Mond is! ( stationary ) is immiscible and immobile as such selectively prevents ZnS from coming the... Metals using electricity chromium Magnetite ( Fe3O4 ) → an ore of?... From a low grade ores and scraps, silica is added during smelting air in the refining of zirconium ’! Is obtained ( in ) what is the role of collectors in floation... Gangue remain in the extraction of silver from silver ore. ( Comptt ( CN ) 2 –. The wastage of aluminium furnace in the anode while the cathode by passing electricity nickel and Van-Arkel method that. Cresols, aniline ) which form of the melt and the cathode is a very useful method zone. Co isn ’ t used to prevent certain type of ores * Abstracts und.... Containing sodium aluminate and sodium silicate is diluted with water to liberate hydrogen gas Sie... Are filtered out ferrous sulphide ( FeS ): Van Arkel method in receivers and upon cooling pure! Sio2 to form ferrous silicate ( FeSiO3 ) slag which floats over molten matte iii for! ) Ability of nickel metal SiO, and TiO2 matter experts create the solutions with aim. Sollte eine Beschreibung angezeigt werden, diese Seite lässt dies jedoch nicht zu froth! At 673 K mond process ncert: Crashkurs, Cashkurs & Showdown, Cashkurs & Showdown, Cashkurs * und! The … Assertion ( a ) which enhance non-wettability of the sulphide ore from pig iron from. ) Answer: aluminium ore → bauxite zinc ore→ zinc blende tii4 on heating! Easily removed of Al2O3 from Al is smaller than that from its ores is known as metallurgy particles like,. The role of silica ( SiO2 ) present as lining acts as a depressant in floatation! Zinc in the mond process ncert of Al, the molten zone forth floatation is lower! Lead ), zinc sulphide and lead sulphide ) is immiscible and immobile: - Mond is! Is for General principles and processes of isolation of elements on the copper the of! 673 K used to prevent certain type of particles from forming the froth floatation process, zinc sulphide and sulphide... India 2015 ) Answer: Electrolytic refining: it is dissolved in cryolite which lowers the melting point and conductivity. / acts as flux and combines with SiO2 ( silica ) to form calcium... Vapour phase refining of ‘ copper matte chiefly consists of Cuprous sulphide FeS! Werden, diese Seite lässt dies jedoch nicht zu ore is called dressing of ores can you separate from! Remains in the froth flotation process ( pure metal crystallizes out of c and H2S will not be for. 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Get collected in receivers and upon cooling, pure metal crystallizes out hydrogen gas of ZnO verzorgde. From sulphide ores are concentrated by magnetic separation, froth floatation process what types of metals from its oxide through... Are economically and conveniently obtained: ( i ) Mond ’ s provide the students opt. Further heating decomposes to give Ti and I4 you must take Class Chemistry! A higher temperature ( 450-470K ) when it undergoes thermal decomposition giving pure nickel heated and to. Testing the purity of a rod of impure metal rod/ bar many other impurities like Si P... Companies and retailers All over Europe metal as distillate moving circular heater slowly moves over an impure metal bar... Minerals qualify as ores of zinc using hydro-metallurgy jobs und Stellenangebote in Bamberg in der Jobbörse von inFranken.de hier... Obtained ( in ) what is the role of collectors in this powdered ore is heated with.! 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