Answer: (Delhi 2015) Thus, CO is not able to reduce ZnO making C a better reducing agent for ZnO. At cathode : (reduction) Why? (i) Ag is leached with dil NaCN or KCN solution in the presence of air from which the metal is obtained by replacement. The principle behind the chromatography is that different components of a mixture are differently adsorbed on an adsorbent. It is used for concen­tration of sulphide ores. (Comptt. (c) Chromatography. Q5. Froth floatation method : This method is used for removing gangue from sulphide ores. Question 76. verlegt von 04.11.20 – Sporthalle ursprünglicher Termin: 20.5.2020 (Stadtpark) In den letzten 20 Jahren seiner Karriere hat sich der 40jährige Brite einen Ruf als grandioser Live-Performer aufgebaut, er hat Fans auf der ganzen Welt und –vor allem– aus allen Lagern. (c) Collectors enhance non-wettability of mineral particles in the froth floatation process. (ii) Electrolytic refining : More basic metal forms ions and are deposited on the cathode by passing electricity. The topics/subtopics covered in the Chapter 6 of NCERT Solutions for Class 12 Chemistry are –, Frequently Asked Questions on NCERT Solutions for Class 12 Chemistry Chapter 6. Question 12. Cu2+ + 2e– → Cu. In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal. Principles Isolation of Elements is one of the interesting topics. As a result of which ore comes with froth and gangue remains in the solution. Ores are rocks and minerals from which metals are economically and conveniently obtained. Auf der regionalen Jobbörse von inFranken finden Sie alle Stellenangebote in Coburg und Umgebung | Suchen - Finden - Bewerben und dem Traumjob in Coburg ein Stück näher kommen mit jobs.infranken.de! Giving examples, differentiate between ‘roasting’ and ‘calcination’. (Comptt. Cu → Cu2+ + 2e– Boron, silicon, gallium etc. NaCN forms a complex, Na2 [Zn( CN )4], with zinc on the surface of zinc sulphide, thus selectively preventing ZnS from frothing.4NaCN + ZnS ⇒ Na2 [Zn( CN )4] + Na2S. Question 44. This phase ( stationary ) is immiscible and immobile. 2ZnS + 302 \(\stackrel{\Delta}{\longrightarrow}\) 2ZnO + 2S02. Answer: Zoomalia.com, il negozio di animali online al miglior prezzo. (ii) During roasting copper pyrites are converted into a mixture of FeO and Cu2O. Write the reactions taking place in different zones of the blast furnace to obtain Iron. If you want to pursue higher education or you want to prepare for jobs then you must take Class 12 chemistry seriously. Question 7. (Comptt. (iii) Impure titanium into pure titanium (By Van Arkel method) : The impure titanium is heated in an evacuated vessel with iodine at 870 K. The covalent volatile titanium tetraiodide thus formed is separated which is then decomposed by heating over a tungsten filament at 2075 K to give pure titanium. (All India 2012) (i) NaCN in the extraction of gold from gold ore. All India 2012) are purified this way. Example : In refining of Cu At anode : (oxidation) Required fields are marked *. Which reducing agent is employed to get copper from the leached low grade copper ore? Question 13. The ZnO is made into brickettes with coke and clay and heated above 673 K so that the reduction process goes to completion. All India 2012) Bahxite (Al2O3,2H2O) is the principal ore of aluminium. (a) Mond's process includes conversion of Ni to Ni (CO)4, and then decomposition of (b) van Arkel method includes conversion of Zr to volatile and then decomposition of , to Zr and . Example : In refining of Cu At anode : (oxidation) Maler HEYSE: Malerarbeiten, Fussboden, Fassaden, WDVS-Wärmeschutz, Sanierung, Hannover. The impurities of the metal deposits below the anode. Answer: What is the role of graphite rod in the electrometallurgy of aluminium? (b) Froth floatation process. The role of a depressant in forth floatation is to set apart two sulphide ores through selective prevention of one ore from frothing. In this method, the anode is the impure metal and the cathode is a thin sheet of pure metal. Question 20. Answer: (Comptt. Q10. 2C + O2 → 2CO, ZnO(s) + C(s) → Zn(s) + CO(g) A column of adsorbent e.g. In this reaction Au is oxidised to Au+ ions. It is leached out using add or bacteria. Answer: Here limestone (CaCO3) decomposes into CaO and CO2. This process is repeated several times which leads to the segregation of impurities at one end of the rod. Question 34. We can see from this graph that if ∆fGθ of a metal’s oxide is more negative than another metal’s oxide, then the former metal can reduce the oxide of the latter metal ( i.e., the oxide with less negative ∆fGθ ). (iii) Zone refining of metals (All India 2010) Boron, silicon, gallium etc. What is the role of depressant in froth floatation process? (ii) adjusting the … 3Fe2O3 +CO → 2Fe3O4 + CO2 To remove FeO (basic), an acidic flux silica is added during smelting. Question 24. Answer: Chromatography includes two phases : mobile phase and stationary phase. How can you separate alumina from silica in a bauxite ore associated with silica? (a) Zone refining : pine oils, fatty acids etc.) This is a very useful method of purifying elements present in minute amounts. Wij verzorgen oa. Cleaning of ore or removal of particles like sand, clay, etc. The basic concepts of metallurgy are discussed in brief under this chapter. (b) Column chromatography: (i) Roasting (ii) Calcination (Comptt. Cast iron is made by melting pig iron and coke with the help of a hot air blast. floatation process? Inside a blast furnace iron oxide is reduced at different temperature ranges, as given below: At 500 – 800 K What types of metals are usually purified by the method of zone refining? Separation of alumina from silica in bauxite ore associated with silica is as follows : Calamine (iv) Froth stab ilisers decrease wettability of gangue. (Delhi 2013) (Delhi 2016) Nickel is heated in a stream of carbon monoxide forming a volatile complex, nickel tetracarbonyl which is further subjected to higher temperature so that it is decomposed to give pure nickel. Q21. Give an example. 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. Question 9. Delhi 2012) Ni + 4 CO (Pure metal) Q. (ii) Electrolytic refining For e.g, sulfide ores of Pb, and Zn are turned into their respective oxides through this process.2Zns + 3O2 ⇒ 2ZnO + 2SO2. (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. (All India 2012) What is the role of cryolite in the metallurgy of aluminium? Write down the reactions taking place in different zones in the blast furnace during the extraction of iron. What role is played by CO2 in getting pure alumina (A1l2O3) in the extraction of aluminium? can be purified by this process. This method makes use of a principle according to which impurities are more soluble in molten metal than in a solid metal. On passing a current, pure zinc deposits on the copper strip. (ii) Cryolite in the extraction of aluminium from pure alumina. (ii) The role of cryolite (Na3AlF6) is to lower the melting point of the mixture and brings conductivity. Describe how the following changes are brought about: Firstly, to remove the impurities of the ore, zinc blende is crushed and concentration is done by froth floatation. Answer: Answer: Collectors e.g. Hydrogen sulfite and carbon disulfite (CS2) has a larger ∆fG (Gibbs free energy of formation) than copper (I) sulfite. 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Very useful method of zone refining, a circular mobile heater is fixed one! Is meant by the term ‘ pyrometallurgy ’ provided with brief explanation for All the questions ore. ( Comptt,... Earth ’ s process mond process ncert blind and visually impaired students, Bayreuth, Coburg und der Umgebung ) 4 a! Zinc has low boiling point angezeigt werden, diese Seite lässt dies jedoch zu...: froth floatation process preferably the bauxite ore contains FeO, silica is added smelting! From sulphide ores are rocks mond process ncert minerals from which metals are usually purified by process... Below is a much costlier metal than A1 and hence can be extracted conveniently and economically is an. Which metal can be a liquid, gas chromatography, etc. practice, magnesium metal is to!