metallurgy class 10 icse

(ii) Oxides of highly active metals like Na,K,Ca,Mg,Al are reduced by electrolytic reduction of their fused salts. Metals are lustrous, malleable, ductile and are good conductors of heat and electricity. Metallurgy: The different processes involved in the extraction of pure metals from their ore are collectively called metallurgy. The ore is heated in the absence of air. (b) Aluminium vessels should not be cleaned with powders containing alkalis because aluminium reacts with alkalis to produce meta aluminate. The anode has to be replaced from time to time, as it gets oxidised by evolved oxygen. Selina solutions for Concise Chemistry Class 10 ICSE chapter 7 (Metallurgy) include all questions with solution and detail explanation. Position in the Periodic Table: Period 3,Group IIIA(13). with a 125% durability bonus and 10% enchantability penalty of the iron rod. Hence gold ornaments look new even after several years of use. (e) Name an allotrope of a non-metal that allows electricity to pass through it. (iii) What are the two aluminium compounds in the electrolyte C? (f) A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina. Watch Acids bases salts @https://www.youtube.com/watch?v=472kQ6OU21A The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. (iii). Thick graphite rods are used as the anode. Lesson; Ncert; Imp Qns; Worksheets; General properties with special reference to physical properties: state, lustre, melting point, density, ductility, malleability, brittleness, conduction of electricity (exceptions to be specifically noted - e.g. Like this chapter so far? (sulphide/carbonate) ores are subjected to ……………. The ore from which aluminium is extracted must first be treated with ………………. Why do gold ornaments look new even after several years of use? (iii) A metal present in Period 3, Group 1 of the periodic table. One of the elements in the alloys is essentially a metal, while the other element or elements may be metals or non-metals like carbon, silicon, sulphur or boron. (e) Give the equation for the reaction which occurs at the anode when aluminium is purified by electrolysis. Name the alloy used for the following purposes. Gold is a noble element and will not form new compounds easily. (b) Aluminium is formed at electrode A. (c) Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process. Metals like copper, lead and iron are placed in the middle of the activity series and re moderately reactive and their oxides can be reduced by carbon, CO and hydrogen. A Duralumin is unaffected by moist air, while aluminium gets affected by moist air. State its use with an example. References. Give example and equation for calcination. These added elements improve hardness, wear resistance, toughness and other properties. (a) In the electrolytic reduction of alumina, the graphite anode is gradually consumed. Isolation of metal from the concentrated Ore iii. They are lustrous, malleable, ductile and good conductors of heat and electricity. Alloys are inert to commonly used chemicals such as Sulphuric acid , hydrochloric acid and sodium hydroxide. What do you observe when hydrogen is passed over heated copper oxide? Select Class Class 6 Class 7 Class 8 Class 9 Class 10. ICSE Class-10 keyboard_arrow_right; Chemistry keyboard_arrow_right; Metallurgy keyboard_arrow_right; Metallurgy of Aluminium . (ii) Metal atoms tend to have a maximum of …………… electrons in the outermost energy level. (i) The ore is heated in the absence of air. Ores are those minerals from which the metals are extracted commercially at low cost and comfortably. (calcination/roasting) which is done in the absence of air. (iii)  Along with cryolite and alumina, another substance is added to the electrolyte mixture. (iii) Moisture and organic impurities are removed and the ore becomes porous and more reactive. Mountain Metallurgy Unique stones & techniques make every Mountain Metallurgy piece truly one-of-a-kind. Why? Define the following terms : (i) mineral (ii) ore (iii) gangue (iv ... 10. (a) Duralumin are aluminium (95%), copper (4%), magnesium (0.5%) and manganese (0.5%). However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance’. Now give your ICSE Chemistry exam preparation a boost with LearnPick's chapter-based ICSE Class 10 Chemistry - Metallurgy mock test. Select a Chapter from the menu to view the specific chapter. Moisture and organic impurities are removed and the ore becomes porous and more reactive. Zinc blende (sphalerite) is the ore of zinc containing its sulphide. Summary. (a) The main ore used for the extraction of iron is, (b) Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as. Metals can form positive ions by losing electrons to non-metals. (a) Zinc is used to cover iron so as to prevent rusting of iron. Main components of duralumin are aluminium, magnesium, copper and manganese. These tests are the closest you can find to that of a real examination. Like this chapter so far? So it is extracted from its oxide by electrolysis. Impure metal is made anode while a thin sheet of pure metal is made cathode and electrolyte used is a salt of solution of a metal to be refined. Main components of bronze are copper, zinc and tin. (b) Solder are lead (50%) and tin (50%). (b) Which impurities are present in bauxite? (b) Name the methods used for purification? Free PDF download of Class 10 Chemistry Chapter 7 - Metallurgy Revision Notes & Short Key-notes prepared by our expert Chemistry teachers as per CISCE guidelines. (a) Name the methods by which concentrated ore is converted to metallic oxide. (b) A metal which is always present in the amalgam. ICSE Grade 10; Chemistry; Electrolysis Study of Compounds . ____ is the process of reducing metal oxide … Study of … ICSE 10 Chemistry > Metallurgy . The Selina Chemistry Class 10 Chapter 7 Solution will provide the student with the best answers to the unsolved questions being asked in the concise chemistry for class 10 ICSE. Metallurgy is the process of extraction of purest form of metals which include both physical and chemical process.
2. (ii) A compound added to lower the fusion temperature of an electrolytic bath in the extraction of aluminium. A metallic compound is a compound that contains one or more metal elements. Aligned with 2021 board exam pattern. Carbonate is converted into oxide by loss of CO2 which takes place in the absence of air and when heated strongly. (e) Why ‘food containing iron salts’ should not be cooked in aluminium utensils? The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide. Volatile impurities are removed as oxides (SO, 3. (i) The ore is heated in the excess of air. • Metallurgy comprises of 3 steps: i. (a) A is made of carbon and B is thick graphite rod. so that pure aluminium oxide can be obtained. c. Arrange the above metals in the decreasing order of reactivity. (ii) Write down the word which correctly completes the following sentence. State the property of the metal being utilised in the following: (i) Name a metal which is found abundantly in the Earth’s crust. Answer: (i) The given metals are arranged in the activity series of metals as follows: Na, Ca, Mg, Al, Zn, Fe, Pb (most reactive) and Cu (l… Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer’s process.  [5], Concise Selina Solutions for ICSE Chemistry Class-10. (ii) Write the equation for the action of heat on aluminium hydroxide. How are the following metallic oxides reduced? It would occupy the position based on its formation of the positive ion. Exercise 7(A) 1. (a) Aluminium used in aircraft construction. It contains 60% Al. Gold occupies the lowest position in the metal activity series. Aluminium is extracted from its chief ore, bauxite. Name an ore on which roasting is done. (ii) Action of heat on aluminium hydroxide: (ii) By dissolving aluminium oxide in cryolite, a conducting solution is produced. (b) Two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen. Which of the following is not the characteristic of alloy ? (b) The following questions are relevant to the extraction of aluminium: (i) State the reason for addition of caustic alkali to bauxite ore during purification of bauxite. Metallurgy ICSE Class-10 Concise Chemistry Selina Solution Chapter-7. Learn from our updated notes now. (c) Carbon can reduce lead oxide but not aluminium oxide. Question 1: (i) Arrange Cu, Ca, Al, Fe, Mg, Pb, Na and Zn in the decreasing order, in which they appear in the activity series; putting down the most reactive metal first and least reactive in the last. The ore is first purified and then the metal is extracted from it by electrolytic reduction. (d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis. This hard, tightly adhering film of aluminium oxide prevents corrosion. (i) Name the process used for the purification of bauxite. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite. (a) On which factors does purification of metals depend? (ii) Differences between calcination and roasting: (iii). Froth flotation process is used for the enrichment of sulphide ore. (v) Constituents of the electrolyte for the extraction of aluminium are pure alumina (, cryolite (Na3AlF6) and fluorspar (). (b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. (i) A metal present in cryolite other than sodium: Aluminium. Dental amalgam is a mixture of mercury and a silver tin alloy. ICSE Solutions for Class 10 Science ... Metallurgy - Chemistry Class X ICSE. Name the substance and give one reason for the addition. The oxides of these metals are reduced to metals by heating their oxides. Get the revision notes in your mailbox! (a) A to F below relate to the source and extraction of either zinc or aluminium: (i) Write down the three letters each from the above list which are relevant to. (d) Graphite Thick graphite rods are used as the anode in electrolytic reduction. Selina Concise Chemistry Class 10 ICSE Solutions Metallurgy July 18, 2017 by Veerendra APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 10 Chemistry Chapter 7 Metallurgy. (a) Three classes in which elements are classified are: Metals,     Non-metals  and  Metalloids, Name the metal which is a constituent of: (a) Blood pigment (b) Plant pigment, (a) The metal which is a constituent of blood pigment is Iron (Fe). An alloy is a homogeneous mixture of two or more metallic solutions. Position and Characteristics of S Block Elements Alkali metals and alkaline earth metals are found in the s … Write equations: State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition. Students can download the FREE PDF of ICSE Class 10 Chemistry Chapter 7 Metallurgy Revision Notes and use it to clear all their doubts and queries and hence, excel in their examination. Important ores of Aluminium: • Bauxite: Chemial formula is: Al 2 O 3. What is meant by the term metallurgy? (a)The following is a sketch of an electrolytic cell used in the extraction of aluminium: (i) What is the substance of which the electrodes A and B are made? The process used for the concentration of the ore is froth floatation process. How it is: You craft 2 carmot ingots with an iron rod, and you get a carmot . (c) A metal which occurs as carbonate is zinc. Examples: AgNO3 – Silver nitrate is a metallic compound. Focus on reaction involve during Calcination and Roasting. All exercise questions are solved & explained by expert teacher and as per ICSE board guidelines. (e) a non-metal which can form a positive ion. Ductiulity. Firstly you have to study that just as you read an other topic. Let QuizNext’s Artificial Intelligence help you in precise revision. Purification of the metal 3. (iii) Non-metallic elements tend to form acidic oxides, while metals tend to form basic oxides. Three classes in which elements are classified are: Metals, Non-metals and Metalloids Copper was the first metal used by man. Elements can be classified as metals and non-metals. 2. Read the Chapter -7 Metallurgy carefully. (b) Zinc blende is converted to oxide by roasting process. (d) Electrolytic reduction is done to obtain aluminium. (b) Calcination is the process of heating the concentrated ore such as carbonate or hydrated oxide to a high temperature in the absence of air. 2. Nature of impurities present in the metal. (b) In Hoope’s process, pure aluminium is collected at the top of the electrolytic cell. ICSE Class 10 Chemistry Metallurgy Physical Properties of Metals and Non-Metals Metals are electropositive in nature. References. (a) Hydraulic washing:- The difference in the densities of the ore and the gangue is the main criterion. Selina Concise Chemistry Solution for ICSE Class 10 Chapter 7 Metallurgy If we look at the general definition of metallurgy, it is defined as a process of extraction of metals in their pure form. (i) Presence of other metals and non-metals like Si and phosphorus. Aluminium has a great affinity towards oxygen and so cannot be reduced by carbon or carbon monoxide. this chemistry blog is for 10 class icse, cbse and pg students; main contents of this blog are (1) 10th class chapter wise questions, past papers, tips and video lecture on hard topics. (b) Zinc blend is converted to oxide by ……… (roasting /calcination) process. Concentration of Ore ii. (a)  When bauxite is treated with sodium hydroxide solution, what happens to. (iv) Why is it necessary for electrode B to be continuously replaced? But First,Let us go through an interesting statement, Nernst Distribution Law
A man named NERNST stated a law which helped people to explain this concept easily. (v) Write the constituents of the electrolyte for the extraction of aluminium. These are first converted into oxides and can be reduced by C, CO or H2. (d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis. (i) It is removal of oxide or halide from a metal. Zinc has a valency2 and carbon has valency 4. How are the metals like sodium, potassium and calcium obtained? Corrosion resistant. (e) Aluminium comes before iron in the metal activity series so it can displace iron from iron salts; thus, food containing iron salts should not be cooked in aluminium utensils. Example: Metal carbonates get decomposed to produce metal oxides. Hey! (iii) Oxides of these metals have great affinity for oxygen than carbon and cannot be reduced by carbon or CO or hydrogen. Extraction of Metals based on the Activity series, Periodic Table, Periodic Properties and Variations of Properties, ICSE 10 Physics - Electrical Power and Household Circuits, ICSE 7 Chemistry - Acids, Bases and Salts, CBSE 10 Biology - Control and Coordination. Question Papers Revision Notes Take Quizzes Solve Worksheets. Read the Chapter -7 Metallurgy  carefully. (ii) Purpose for which metal is to be obtained. Obtaining Aluminium from their Ore. For more practice on Metallurgy try to solve exercise of other publications such as Goyal Brothers Prakshan / new Simplified Dr Dalal Chemistry. Solve this Chemistry test on Metallurgy to score full marks in ICSE class 10 Board exams. Mercury and silver are less reactive and are placed lower in the reactivity series. (a) Alkali metals: They are placed in IA group, the first column on the left of the periodic table. Ans. (a) Define roasting. (a) Two properties of brass that make it more useful than its components are: (b) A metal which forms a liquid alloy at ordinary temperature is sodium. To register Chemistry Tuitions on Vedantu.com to clear your doubts. Focus on reaction involve during Calcination and Roasting. State the position of aluminium in the periodic table. Select Class Class 6 Class 7 Class 8 Class 9 Class 10. (b) Bauxite ore contains approximately 60% aluminium oxide. These are found in nature as sulphides or carbonate. The ore from which aluminium is extracted must first be treated with sodium hydroxide solution so that pure aluminium oxide can be obtained. From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which, a. does not react with dilute hydrochloric acid. Why the anode has to be replaced in this process? (a) When aluminium is exposed to the atmospheric air, it combines with oxygen and a film of aluminium oxide (Al2O3) is formed at the surface. (d) Aluminium oxide is a very stable compound because of its great affinity for oxygen. (a) Nitrogen: It is used to preserve food. (c) Name the element which serves both as anode and cathode in the extraction of aluminium. This means it will not react with other molecules easily. These handwritten notes are for the chapter Metallurgy of ICSE Class 10 Chemistry and have been made after referring to Selina Publishers’ Concise Chemistry Class – X for ICSE 2019. (b) Hydrogen, a non-metal, has been included in the metal activity series because it can form a positive ion. Calcination:- heating of ore in absent of oxygen. (b) Hydrogen: It is used in the hydrogenation of vegetable oils to make ghee. silentgems:sword . Like this chapter so far? Carbonate and hydrated ores are calcined and CO, Dissolves in water and turns blue litmus red, Very low solubility in water; dissolves in hydrochloric acid, Tendency for oxidising and reducing reactions, Very poor electrical conductor; poor thermal conductor, Good electrical conductor; good thermal conductor. 2ZnS + 3O2         2ZnO + 2SO2. Marks and answers are given immediately. (b) Define calcination. An anode is made of carbon which gets oxidised in the presence of oxygen to form carbon monoxide which is a neutral gas. (a) Minerals are naturally occurring compounds of metals which are generally present with other matter such as soil, sand, limestone and rocks. Share to Twitter Share to Facebook Share to Pinterest. The properties of alloys are often greatly different from those of the components. (a) Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer’s process.  [5]. State the position of the following in the periodic table: (a) Alkali metals (b) Alkaline earth metal (c) Halogens (d) Aluminium. QuizNext Revision Notes ICSE 10 Chemistry × Revision note sent on your email! (c) How is concentrated ore changed to oxide? Metallurgy is a chapter of ICSE class 10 Chemistry textbook. (iii) Volatile impurities are removed as oxides and the ore becomes porous and more reactive. (c) Aluminium has a great affinity towards oxygen and so cannot be reduced by carbon or carbon monoxide or hydrogen whereas lead oxide can be easily reduced to metal lead by carbon. The following is an extract from ‘Metals in the Service of man, Alexander and street/Pelican 1976’. Also zinc forms protective layer of ZnO on iron. (a) A metal which is liquid at room temperature. (d) Two metals which react with cold water. They act as an anode where oxygen gas is discharged. (c) Concentrated ore is changed into oxide by heating ZnS in excess of air. (ii) Carbonate and hydrated ores are calcined and so,CO2 and water vapours are given off. (soluble/insoluble) part because of its …………… (acidic/basic/amphoteric) nature. • Metallurgy is a domain of materials science and engineering that studies the physical and chemical behaviour of metallic elements, their inter-metallic compounds, and their mixtures, which are called alloys. arrow_back Alloys. (b) Alkaline earth metal: They are placed in IIA group, the second column on the left of the periodic table. (ii) Metal atoms tend to have a maximum of 3 electrons in the outermost energy level. All ores are minerals, but all minerals are not necessarily ores. (c) Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina. Alnico an alloy of aluminium, nickel and cobalt can lift 60 times its own mass. Use the chapter solutions to revise the principles of electromagnetic separation and hydraulic washing. Both Brass and bronze contain copper as major constituents. This test module contains 10 questions in fill in the blanks format. (e) Anode should replace from time to time as it gets oxidise with oxygen evolve at the anode. Here, we present fill in the blanks test on Metallurgy. It is not reduced easily by common reducing agents such as carbon or hydrogen. (b) State three objectives achieved during the roasting of ores. (b) (i) It removes moisture from the ore. (ii) It expels oxide. (d) A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium. (iii)  Non-metallic elements tend to form …………… oxides, while metals tend to form ……………. (a) Usually carbonate ores are subjected to calcination which is done in the absence of air. Pure aluminium oxide is dissolved in cryolite  to make a conducting solution. (iii) The ore of zinc containing its sulphide. (c) The compound formed by the reaction between calcium oxide and silica. The three ways in which metal zinc differs from the non-metal carbon is: (a) Aluminium is a more active metal than iron but suffers less corrosion. QuizNext Learning Material ICSE 10 Chemistry × Revision note sent on your email! (a) During the concentration of bauxite ore, aluminium goes in the soluble part because of its amphoteric nature. metals and non metals comparison: Activity series of metals: extraction of metals - Metallurgy: Extraction of Aluminium from Bauxite: Hall Heroult's process : uses of Alumnium, Alloys composition: Posted by syed yasen ali at 18:32:00. (ii) A metal which is unaffected by dilute or concentrated acids. (b) Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtain on heating aluminium hydroxide. Select Subject Maths EVS Biology Chemistry Physics. Return to Concise Selina Solutions for ICSE Chemistry Class-10, Biology 2010 Solved Paper Previous Year Question ICSE, Periodic Table ICSE Class-10 Concise Chemistry Selina Solutions, Introduction to Physics HC Verma Solutions Vol-1 Class-11 Physics Ch-1, OP Malhotra Linear Programming ISC Class-12 Maths Solutions Ch-28, OP Malhotra Linear Regression ISC Class-12 Maths Solutions Ch-27, OP Malhotra Application of Integrals ISC Class-12 Maths Solutions…, OP Malhotra Application of Calculus in Commerce and Economics ISC…, OP Malhotra The Plane ISC Class-12 Maths Solutions Ch-24, Privancy Policy | Sitemap | About US | Contact US, Metallurgy ICSE Class-10 Concise Chemistry Selina Solution. How do properties of an alloy differ from its constituents? Alloy is a homogeneous mixture of two or more metals or of one or more metals with certain non-metallic elements. (b) Which process is applied to concentrate it? (c) Bronze are copper (80%), tin (18%) and zinc (2%). (c) Electromagnetic separation:-  Magnetic properties of the ores. Pure aluminium oxide is dissolved in ….. to make a conducting solution. (a) Balanced equations for the purification of bauxite: (b) Chemicals used for dissolving aluminium oxide: Fluorspar and cryolite Alumina 20%, cryolite 60%, fluorspar 20%. Aluminium is a more active metal than iron but suffers less corrosion. (c) Copper in electrical appliances or household vessels.  (i) Processes involved in concentration are: (ii) Processes involved in Refining of ores are: (b) Potassium and sodium oxides cannot be reduced by carbon, carbon monoxide and hydrogen. What is an alloy? Distinguish between electrolytic methods of reduction and refining. Give the importance of the following in living beings: (a) Nitrogen, (b) Hydrogen, (c) Carbon. (iii) . ICSE Class 10 Chemistry- Last Minute Study Resources. Mettalic and Non-mettallic properties, exceptions, contrast among them, extraction of some important ores form the epitome of this unit. Labels: Metallurgy notes. Various Step involve in extraction in Metallurgy. (a) State two properties of brass that render it more useful for some purposes than its components. ICSE 10 Chemistry > Metallurgy. ICSE Class 10 Chemistry / Metallurgy 3- Activity Series - Videos - Videos, ICSE Class 10 Chemistry / Metallurgy 3- Activity Series - Videos - News, ICSE Class 10 Chemistry / Metallurgy 3- Activity Series - Videos - Career Updates metallurgy:carmot_sword. An ore on being heated in air forms sulphurous anhydride. Free download of step by step solutions for class 10 Science chapter 7 - Metallurgy of ICSE Board (Concise - Selina Publishers). From the list of characteristics given below, select the five which are relevant to non-metals and their compounds: J. Reaction with dilute sulphuric acid yields hydrogen. A low percentage of molybdenum improves the toughness and wear resistance of steel. (a) Zinc is electropositive metal than iron, gets oxidized and saves iron. (c) Froth floatation process is generally used to concentrate ………… ores (sulphide/carbonate). This test is totally based on latest Chemistry textbook of ICSE Board. 2. 3. Purpose for which metal is to be used, (a) The metal other than aluminium, which has a strong affinity for oxygen is: (A) Copper (B) Magnesium (C) Silver (D) Gold, (b) A metallic oxide which cannot reduced by normal reducing agents: (A) Zinc oxide (B) Magnesium oxide (C) Copper(II) oxide (D) Iron(III) oxide. Zinc oxidises more readily than iron, thus preventing the rusting of iron. (a) In the electrolytic reduction of alumina, the graphite (anode) is oxidized by oxygen to CO and further forms CO2, so it is consumed and has to be replaced from time to time. https://revision-content-dev.s3.amazonaws.com/52747342-768c-4815-8411-1068436a2750.pdf, 3. (d) Surgical instruments: Stainless steel. (iii). Just like the previous notes in this series, these have also been presented in one page in neat, legible handwriting. Give balanced equation. A metallic oxide which cannot be reduced by normal reducing agents is zinc oxide. Which metal can be extracted from each one of the following ores: The metals that can be extracted from the following ores are: (a) Ore: Minerals from which, the metals may be exerted economically in reasonably pure condition. caustic soda solution (NaOH solution) for 2-8 hours at 140°C to 150°C to produce sodium aluminate. (b) A metal which occurs as halide is silver. Cryolite, Bauxite, Sodium hydroxide solution. (a) Which solution is used to react with bauxite as first step in obtaining pure aluminium oxide? I hand make every piece with love & positive intention. The other elements in Bronze are Tin and Zinc. (c) Froth flotation process is generally used to concentrate sulphide ores. The compounds of metals found in nature are their oxides, carbonate and sulphides. The way it is, I have no reason to craft a "classic" Metallurgy item over a Silent Gems one. (b) Forth floatation:- This process depends on the preferential wettability of the ore with oil and the gangue particles by water. Frank solutions for ICSE Class 10 Chemistry Part 2 chapter 7 (Metallurgy) include all questions with solution and detail explanation. The ore zinc blende is roasted in order to get zinc oxide. (iii) Fluorspar is added along with cryolite and alumina because this helps the mixture to fuse at  instead of, and the aluminium obtained at this temperature is in the liquid state. Why? The chemical equation is as follows: Second, on diluting sodium aluminate with water and cooling to 50°C, sodium aluminate is hydrolysed to give aluminium hydroxide as precipitate. Obtaining Aluminium from their Ore. For more practice on,  Selina Concise Solution Metallurgy ICSE Chemistry, Bauxite Aluminium is extracted from bauxite ore. a. does not react with dilute hydrochloric acid: Copper. (iv) Non-metallic elements tend to be …………… conductors of heat and electricity. The rest being sand, ferric oxide and titanium oxide. This will clear students doubts about any question and improve application skills while preparing for board exams. (b) In the extraction of aluminium, the given compounds play the following roles: (i) Cryolite: It lowers the fusion temperature from 2050°C to 950°C and enhances conductivity. (iii) Why is so much graphite required for the electrolytic process? Hence, electrolytic reduction is done to obtain aluminium. (ii) Generally, sulphide ores are roasted, so SO2 is given off. Wrong! (d) Constituents of brass: 60–70% Cu and 40–30% Zn. Email This BlogThis! (c) The two aluminium compound in the electrolyte C is Na3AlF6, Al2O3.

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