(b) What is |he principal use of slag ? This document is highly rated by Class 10 … Your email address will not be published. Question 1: Why are metals called reducing agents ? Calcinated ore is then treated with NaOH when Al2O3 is converted into soluble NaAlO2.Fe2O3 can thus be filtered off. Explain briefly how these impurities are removed in each case. (b) What is the main difference in chemical composition of cast iron and steel ? Write the equation for the reaction which takes place when the sulphide ore is roasted. All the three ingredients are crushed into small round pieces and mixed and put on a hopper which controls the input. (ii) The arrangement of metals in the order of their decreasing activity, in which the most reactive at the top and the least reactive at the bottom are placed in the series. (b) Iron ore, lime stone, and coke are used in the extraction of iron. Answer: (i) (a) Copper (b) Zinc (c) Magnesium (d) Iron (ii) Sodium > Magnesium > Iron > Zinc > Copper. (a) With reference to the reduction of copper oxide, iron(II)oxide, lead(II)oxide and Magnesium oxide by hydrogen, place the oxides in order of increasing case of reduction. (3) which of the metals in the list is Z ? Hi, there, For history class, Im allowed to do a physical project instead of a six-page write up, and since one of the things we are studying, however briefly, is the Iron Age, an thought Id try to make and refine am iron bloom, and with that, make a socket axe from an Iron Age design. Answer: In activity series of metal, iron occupies a higher position than hydrogen; while silver is placed below hydrogen; hence iron is more reactive than silver and is able to displace hydrogen from dilute sulphuric acid. During this reaction ferric oxide is converted into iron and a large amount of heal is evolved and about 3000°C temperature is achieved. isolation This process is known as tempering of steel and is employed for bringing the steel into a suitable state of hardness and elasticity. APlusTopper.com provides ICSE Solutions for Class 10 Chemistry Chapter 7 Metallurgy for ICSE Board Examinations. (iv) Are liquid zinc and liquid lead miscible or immiscible ? Suggest a reason for this. This is even harder than pig iron. Answer: (i) (a) Haematite (Fe2O3). (ii) (a) Which compound produced from the limestone takes part in forming the slag ? (ii) Give the function of three components of electrolyte. Question 6: Why is sodium metal always stored under kerosene oil ? Question 18: (i) The following represents a summary of the reaction which occur in the “Blast furnace”, leading to the production of molten iron. Answer: (i) Pig-iron does not possess a high tensile strength, hence it cannot withstand with high stress and strain. (ii) What are the main constituents of steel ? Aluminium is collected at the cathode. (iii) What are the two aluminium compound in the electrolyte C ? Concentration removes the water and other volatile impurities such as sulphur and carbonates. It dissolves in many liquid solvents, but it is non-conductor of electricity and heat. (2) Cryolite : It is added to lower the fusion temperature of the electrolytic bath. Thus, lime stone is used to remove the impurities of silicon dioxide present in ore. (b) (1) It is used in the manufacture of cement. What is the name of the zinc compound in zinc blende ? (II) Aluminium is a good conductor of electricity, light in weight, tough and possess high tensile strength and is resistant to corrosion. Answer: (i) Duralumin, an alloy of aluminium, is used in the construction of aircraft; because it is light, resistant to corrosion and has great tensile strength. Question 28: Give the composition and uses of the following alloys : (i) Brass. (ii) (1) Metals are generally solid at room temperature. (v) Write the chemical equation for the formation of the substance named in (iv) above. Here the anode gets oxidised to carbon dioxide, i.e. Learn more in detail about its Definition, Principles with the help of examples with Byju's. In general, as mentioned in Table-1, there are five basic types : white iron, melleable iron, grey iron, and ductile iron, and compacted graphite iron. When an electric current is passed through electrolyte, the heat is also produced which keeps the mass in molten state and alumina gets reduced to free aluminium metal according to the following reactions: Question 9: 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. (b) How can iron or steel be prevented from rusting, when used for ? (ii) Calcium, Copper, Lead, Aluminium, Zinc, Chromium, Magnesium, Iron,. Question 1: The given sketch of an electrolytic cell used in the extraction of aluminium: (i) What is the substance of which the electrode A and B are made ? (iii) German silver. Cryolite 2. This arrangement of metals in a series is called electrochemical or metal activity series. Answer: (i) Carbon (Graphite) (ii) A (iii) Aluminium oxide / Alumina / cryolite (sodium aluminium fluoride). (c) Does not react with cold water but reacts with steam when heated. Wrought Iron/ Malleable Iron Wrought iron is the purest form of iron available commercially available and is prepared from cast iron by heating cast iron in a furnace lined with Haematite (Fe2O3). Why ? (2) If fused metallic chloride is electrolysed, at which electrode the metal will be obtained. Question 25: (i) (a) With reference to the reduction of copper oxide, iron (II) oxide, lead (II) oxide and magnesium oxide by hydrogen; place the oxides in increasing order of reduction, i.e., first the oxide that is most difficult to reduce; and at last, the oxide that is most easy to reduced. 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 (least reactive) (ii) (a) (1) Sodium and calcium displace hydrogen from cold water. (ii) How is zinc extracted from zinc blende [ZnS] ? (ii) Sodium metal is Extracted by the electrolysis of fused sodium chloride. Zinc placed in ferrous sulphate solution. 2. (b) By painting and by coating with nickel. (i) Which of A and B is the cathode and which one is the anode ? The reduction of metallic oxide inside the blast furnace. (v) Because of the maximum liberated heat coke reduces zinc oxide to zinc vapours to volatize a brilliant glow. ICSE Solutions Selina ICSE Solutions ML Aggarwal Solutions. (ii) The rusting of iron is a process of atmospheric corrosion, i.e., slow destruction of iron by moisture and atmospheric oxygen. (ii) Steel is an alloy of iron and carbon containing very small amounts of impurities, that are present in the cast iron. (b) Hydrogen gas is generally liberated when metals react with dilute acid. (2) Graphite, an allotrope of carbon is a good conductor of electric current. (b) (1) Magnesium reacts with boiling water to liberate hydrogen gas, while iron can do so with steam in red hot condition only. (ii) The process shown is cathode protection. Answer: (i) In this process, the heavy material containing metal, is floated upward with froath to separate it from,waste material present in ore or mineral. (b) Sulphur is non metal because, it gives negative sulphur ions by gaining of two electrons. Besides iron, it contains about 4% of carbon and small quantities of silicon, phosphorus, manganese and sulphur. What are the Trapezoidal rule and Simpson’s rule in Numerical Integration? (ii) In the electrolysis of molten alumina, the carbon anode is gradually burnt away. (a) X, Y and Z are coded letters for three of the metals in the activity series of metals as given above, Metal X, reacts violently with cold water and its hydroxide is not decomposed by heat. 5. In case of iron, Fe2O3 + 3CO 2Fe + 3CO2 Al2O3 cannot be easily reduced, hence it is subjected to electrolysis. (ii) Aluminium and magnesium. Describe the symbol for an ion of X. (ii) What is the electrolyte in the tank ? Question 30: (i) (a) How will you show that sodium is a metal ? (iii) Name two other metals, which can be extracted by electrolytic reduction method. Pig-iron is brittle in nature and cannot be welded. CBSE Class 10 Science Notes Chapter 3 Metals and Non-metals Pdf free download is part of Class 10 Science Notes for Quick Revision. Metallurgy of Aluminum - Get Get topics notes, Online test, Video lectures & Doubts and Solutions for ICSE Class 10 Chemistry on TopperLearning You can download the Class 10 Chemistry ICSE Textbook Solutions with Free PDF download option. (ii) Non-metals are non-malleable [Brittle]. (2) The metal Y is copper. Reduction of ferric oxide by aluminium powder. Fe2O3 12. Answer: (i) (a) Sodium metal can form positive ions by the loss of one electron, this metal is electropositive. So, a large amount of energy is needed to maintain this high temperature. Question 1. by painting and applying grease on the articles. (iv) Stainless steel. Write the equation for this reaction. Question 16: (i) What is froath floatation process and for, what purpose it is used ? 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. (iii) Galvanized iron is used in making different varieties of tools for industries, scientific apparatus, and household fittings. Galvanized iron is used in making different varieties of tools for industries, scientific apparatus and household fittings. Question 10: During the extraction of aluminium, cryolite and fluorspar are added to alumina. 2H20 + NaOH ⟶ 2NaAlO2 + 3H2O (iii) The name of substance is Fluorspar (CaF2) and it increases conductivity of the electrolyte. Epsom salt 11. Galvanization is done to prevent corrosion of iron. (2) Stainless steel is an alloy which contains about 18% of Cr, 8% Ni and 1% C. (ii) (a) (1) Bauxite : It is the main ore of aluminium from which aluminium metal can easily be extracted. (ii) (a) For each substance listed below, explain its significance in the extraction of Aluminium: (1) Bauxite. Answer: Because carbon has greater affinity for oxygen than copper and less affinity for oxygen than calcium. (iv) Pig iron and slag are the two products, which are taken out from the blast furnace during the extraction of iron. These are removed by magnetic separation. hydrochloric acid. Formation of Hag inside the blast furnace. (iii) What are the differences between a mineral and an ore ? Bauxite containing FeO is calcinated at high temperature when FeO is oxidised to Fe2O3. Reduction of zinc oxide. (2) Oxygen gas is produced at the graphite anode, which combines with carbon to form carbon dioxide gas at high temperature and thus anode destroys away. Answer: (i) Metals are good conductor of heat. Reactions in the Blast furnace at 500 – 800 K, In the upper parts with lower temperatures. State how zinc leaves a furnace. (c) Write equations that occur in the “Blast Furnace”. Uncategorized questions based on metallurgy class 10. Answer: (i) (a) Aluminium-Bauxite. (i) Write down the three letters each from the above list which are relevant to : (1) Zinc (2) Aluminium. Re-learn the concepts that you’ve studied by using our short key notes for NCERT textbooks. A. Bauxite: B. Coke C. Cryolite D. Froth floatation E. Sodium hydroxide solution. (iii) (a) How are the following protected from rust ? The entire scientific and technological process used for isolation of the metal from its ores is known as ____. (4) Sodium hydroxide. Pb + 4HNO3 ⟶ Pb(NO3)2 + 2H2O + 2NO2 Lead present in solder is confirmed as below : Question 14: The basic materials needed for production of iron in the blast furnace are lime stone, coke and air in addition to the iron ore. (i) (a) Name one iron ore and write its formula. Give one example. Question 7: Why carbon can reduce copper (II) oxide to copper but not calcium oxide to calcium ? Also available in Class 12 Medical - Occurrence of Metals Class 12 Engineering - Occurrence of Metals Iron thus occurs in nature in the form of its compounds and not as a free element. Hence it is called froath floatation process. The insoluble impurities which settle at the bottom in Electrolytic refining is called: Na – e– ⟶ Na+ Sodium has high density and is less dense then water. CaO + Si02 ⟶ CaSiO3 (Calcium Silicate) [Slag] The slag, is formed at the surface of blast furnace from where, it is removed from time to time. (ii) What is the purpose of using : (a) The coke (b) The limestone (iii) Write the equation for the reduction reaction which produces iron. (c) Metals are reducing agents whereas non-metals act as oxidising agents. A blast furnace is a gigantic, steel stack lined with refractory brick where the concentrated iron ore, coke, and limestone are dumped from the top, and a blast of hot air is blown into the bottom. (iii) Calcium, and magnesium are other two metals, which can be extracted by electrolytic reduction method. 1. (ii) The element X, contains one electron in the outermost orbit of its atom, which can be easily donated and one unit of positive charge is gained on its ion. (ii) Take the given sample of solder and dissolve it in concentrated nitric acid. (c) Aluminium metal is protected by a thin film of aluminium oxide, which sticks firmly with the metal and prevents further corrosion. 11. Available for CBSE, ICSE and State Board syllabus. (2) The carbonate of Y. (iii) Reduction of zinc oxide. (c) Non-ferrous alloys. Limestone is then added as flux, and it creates the slag. 8. a. Flowchart Example – Simple Algorithms. In the froth floatation method, pine oils, fatty acids, xanthates, etc. (c) (1) Cast iron contains about 4% of carbon. (ii) Zinc blende is oxidized to zinc oxide by roasting in presence of excess air, (iii) Reduction of zinc oxide. (ii) Reduction of the oxide is an important step in extraction of metal. Sodium is collected at cathode, while chlorine gas is liberated at anode; as an important by product. (iii) Iron and aluminium ores both, contain impurities. (iii) Along with cryolite and alumina, another substance is added to the electrolyte mixture. (2) Explain why it is necessary to renew the anode from time to time. Dilute the solution with water and add dilute hydrochloric acid. The percentage of carbon in gray cast iron is in the range of (A) 0.25 to 0.75 % (B) 1.25 to 1.75 % (C) 3 to 4% (D) 8 to 10 %. PbS 3. (b) Has a hydroxide that reacts with both acids and alkalies. (v) Brass [7% of Cu, 30% of Zn]. It is the process of heating concentrated ore in a free supply of air to a temperature insufficient to melt the ore. During calcination, no other chemical change occurs except decomposition. Fe + H2SO4 ⟶ FeSO4 + H2↑. (iv) Iron. It also increases conductivity alongwith fluorspar. Question 26: (i) How are the alloys classified ? Wrought iron is the purest form of iron available commercially available and is prepared from cast iron by heating cast iron in a furnace lined with Haematite (Fe2O3). According to new CBSE Exam Pattern, MCQ Questions for Class 10 Science pdf Carries 20 Marks. Answer: (i) Zinc sulphide [ZnS]. (iv) For galvanising iron sheets to prevent rusting. (c) Lead—Galena. Write down the missing statements (i) to (iv). (iii) It is an alloy of copper, zinc and nickel and is used for making ornaments and utensils and also used for decoration. Solution 2: (a) The metal which is a constituent of blood pigment is Iron (Fe) (b) The metal which is a constituent of plant pigment is Magnesium (Mg). C + O2 ⟶ CO2 Or 2O2- – 4e– ⟶ O2 Thus, electrodes are made of graphite. (c) Following are the reactions, which take place in the “Blast Furnace”, during the extraction of iron. Choose the major metals from the list given above to make the following alloys: (a) Stainless steel. (iv) Carbon is major impurity present in iron. Corundum 4. (iii) Bronze. The electrons from anode get oxidised and move towards the cathode, cover it. Question 3: Why iron is not found in free state in nature ? (b) Give two evidences to show that magnesium is more reactive than iron. Answer: (i) (a) Lime stone decomposes at a higher temperature of blast furnace, to form calcium oxide and carbon dioxide. 8. The first has been done for you. Answer: (i) (a) (1) The metal X is sodium. Answer: (i) Alloys are classified on the basis of their constituents. Metals generally contain 1 to 3 valence electrons in their outermost shell whereas non-metals contain 4 to 7 valence electrons in their outermost shell. (c) Aluminium is more active than iron and yet there is less corrosion of the aluminium, when both are exposed to air. (ii) Zinc blende is oxidised to zinc oxide by roasting in presence of excess air on reverberatory furance. Zincite 6. (ii) (a) Coke acts as a reducing agent, (b) Limestone acts as a flux. ” (iii) What in addition to a zinc compound, is put into the blast furnace ? (ii) How is the metal sodium extracted ? It cannot be reduced by hydrogen, while the last three members are reduced by hydrogen to their metals according to reactivity series. ICSE Class-10 keyboard_arrow_right; ... Metallurgy of Aluminium . (ii) What is the purpose of adding lime stone in the extraction of iron from haematite ? Lime is the compound which takes part in the formation of slag. Question 22: The following substances are put into the blast furnace while manufacturing iron : Iron ore, coke, limestone and hot air. Gypsum 9. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance.’ (i) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide ? (iii) How many valence electrons are present in (a) Metals, (b) Non-metals, Answer: (i) (1) B, D, F (2) A, C, E (ii) (1) Mercury metal exists in liquid state at room temperature. Al+3 + 3e– ⟶ Al. (ii) Mixture of fluorides. (ii) (a) Give a reason, why aluminium cannot be obtained from aluminium oxide; by the “Blast Furnace Process” or “Carbon Reduction Process.” (b) Name the properties for which aluminium is used in: (I) Cooking utensils, (II) Overhead electric transmission wire. 7. Question 6: (i) The ore zinc blende, is an important source of the metal zinc. (c) (1) In the Bessemer process it takes only a few minutes to convert cast iron into steel. Dolomite 5. Due to the higher percentage of carbon in cast iron, it resists corrosion. Give the formula of the slag. Posted on November 30, 2020 by November 30, 2020 by (c) Higher up in the furnace, the iron ore is reduced to iron by one of the gases produced in the furnace. Metals and Non-metals Class 10 Science Notes Answer: In moist air, a thin layer of aluminium oxide is formed on it quickly which protects aluminium to oxidise. (2) It is used as a fertilizer. Question 29: (i) Write a note on thermite welding. Answer: Because duralumin is harder, stronger and more resistant to corrosion. (iii) What is tempering of steel ? (iv) It is an a Hoy of lead, antimony and tin and is used for making printing type. X – e– ⟶ X+ The symbol of X ion is X+. (iii) What would you expect to happen, if aluminium metal is heated with iron (III) oxide ? Action of Copper sulphate solution on zinc. The blog presents the short Questions and Answers of the Chapter 1, Metallurgy, from Science Part I of Class 10 from Maharashtra State Board. 10. (iii) Copper and Tin. On the other hand, ferric salts give a reddish brown precipitate of ferric hydroxide with caustic soda. (3) Graphite acts as an anode. (iii) It is clear from the properties of X, that the metal X is supposed to be highly positive in nature, hence it is extracted by electrolytic reduction method. Aluminium is the most abundant metal in the earth’s crust, where it is found in the form of hydrated oxides ... alumina is heated with cryolite and fluorspar in an iron tank with a lining of carbon inside. (iii) Atom of metals contain 1, 2 and 3 valence electrons, while the atom of non-metals contain 4,5, 6 and 7 valence electrons. CaCO3 ⟶ CaO + CO2 (Carbon dioxide)↑ Calcium oxide combines with sand, present as impurities, to form calcium silicate known as the slag. (iii) Why is electrolyte covered with coke? Na3AlF6 2. Question 7: The following questions refer to the extraction of alumnium and iron from their ores : (i) “Name the principal ore from which; (a) iron and (b) aluminium are extracted. ZnCO3 ⟶ ZnO + CO2 Zinc oxide so obtained is mixed with carbon and heated in a specially designed clay retorts, placed in a furnace, where it is reduced to zinc metal and carbon monoxide is formed, which is further used to reduce the ore. ZnO + C ⟶ Zn + CO ZnO + CO ⟶ Zn + CO2. are ____ whereas cresols and aniline are used as ____. Hot air is blown from the bottom and coke it burned to yield temperatures up to about 2200K. Answer: (i) Zinc blende (ZnS) (ii) (a) 2ZnS + 3O2 ⟶ 2ZnO + 2SO2 (b) ZnO + C ⟶ Zn + CO. (iii) Powdered coke. (iii) What are non-ferrous alloys ? Answer: (i) (a) Carbon burns in the presence of oxygen of air to form carbon dioxide which is reduced to carbon monoxide in the presence of coke. Question 2: Why are non-metals called oxidizing agents ? (iii) Fe2O3 + 3CO ⟶ 2Fe(Spongy iron) + 3CO2 (iv) Fusible slag (calcium silicate) (v) CaO + SiO2 ⟶ CaSiO3. (b) (I) Aluminium is a good conductor of heat, light in weight, strong and can be made passive by nitric acid. (iv) What is the major impurity present in iron when it is removed from the blast furnace ? (ii) Answer the following question related to above (i) sequence : (a) Which of these is most likely to tarnish readily when exposed to the air ? There is no reaction between gold and lead nitrate. The magnesium oxide is highly stable. (iii) A layer of powdered cpke is sprinkled over the surface of the electrolyte mixture because it reduces the heat loss by radiation and prevents carbon anode from brning in air. (4) Write the name of the solid A and gas B. (iv) Immiscible. Bauxite Answer: 1. The Haematite reacts with Carbon in the cast iron to give pure iron and carbon monoxide gas which escapes. An answer may be used only once. (ii) (a) Aluminium metal is more electropositive than iron. (b) Calcination and Roasting. (b) Iron—Hematite. Slag is calcium silicate with the formula CaSiO3. CaCO3 ⟶ CaO + CO2↑ (d) Calcium oxide so formed reacts with sand [silicon dioxide] to form calcium silicate, the slag and thus the impurity of sand is removed. Haematite 12. An answer may be used only once. (ii) Name the process shown. 7H2O 11. Iron at low temperature forms a body centered cubic lattice. Question 4: Iron liberates hydrogen from dilute sulphuric acid, while silver cannot. There will be total 10 MCQ in this test. Reduction of lead (II) oxide by carbon. (iv) This method is used for protecting iron from rusting, e.g. How do you find the Minimum and Maximum Values of a Function? Question 23: (i) Name an alloy used in aircraft construction and give a reason for its use. Question 8: Aluminium is highly electropositive metal, in spite of it aluminium does not oxidise rapidly in air. (iii) How is the metal X, extracted from its given salt ? This process is termed as boldschmidts aluminothermic process. (iii) Describe modem method of aluminium extraction. Aluminium metal is collected at cathode, while oxygen gas is liberated at anode according to the following reactions. CaCO3.MgCO3 5. Metallurgy is defined as a process that is used for the extraction of metals in their pure form. This concentrated ore is mixed with limestone (CaCO3) and Coke and fed into the blast furnace from the top. Question 9 of 10. Which metal is extracted from it ? Carbon monooxide is regenerated. Explain this fact. Call our LearnNext Expert on … That is, put first the oxide that is most difficult to reduce, and last, the oxide that is most easily reduced. 16. Why ? Reduction of iron (III) oxide by carbon monoxide. Class-10Tamilnadu Board - Metallurgy of Iron - LearnNext offers animated video lessons with neatly explained examples, Study Material, FREE NCERT Solutions, Exercises and Tests. (b) Bauxite (Al2O3). Galvanization is a process of depositing a thin layer of zinc, over the surface of iron to protect iron from rusting. CaO + SiO2 ⟶ CaSiO3 (ii) Lime stone is added to “blast furnace” in the extraction of iron to remove the impurities of silicon dioxide, i.e., the sand. AgCl 10. Question 12: (i) (a) What is the function of adding the lime stone in the “Blast Furnace”? ANS : C. METALLURGY Multiple Choice Questions with Answers Pdf Download :: Question 19: (i) (a) Name two ores of iron. Metallurgy ICSE Class-10 Concise Chemistry Selina Solution Exercise-7(B) . Ore, lime stone, and it creates the slag about 4 % of Zn ] your answer and whether! Zinc vapours to volatize a brilliant glow furnace ”, during the extraction of iron from?! Reduce the concentrated ore is roasted ICSE Class 10 Science Notes extraction of ; ( a ) is. Spite of it aluminium does not oxidise rapidly in air of energy is needed maintain... 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Iii ) iron, ( b ) What in addition to a insufficient... 800 K, in the blast furnace, where it is the aluminium oxide [ Al2O3.2H20 ] and Magnetite Fe3O4!
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