Contact :8897306498 (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. Metallurgy is defined as a process that is used for the extraction of metals in their pure form. (d) Metals He generally good conductors of heat and electricity whereas non-metals are bad conductors of heat and electricity. (ii) Arrange the metals in decreasing order of reactivity. 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 ? Ores contain all unwanted impurities and a part of required metal too. Or, go ahead and read our blog posts. Describe the symbol for an ion of X. (ii) Bronze. (iv) An alloy usually has some property which makes it particularly useful. Question 6: The table below compare some properties of metals and non-metals. Galvanization is a process of depositing a thin layer of zinc, over the surface of iron to protect iron from rusting. (v) Because of the maximum liberated heat coke reduces zinc oxide to zinc vapours to volatize a brilliant glow. An answer may be used only once. Question 29: (i) Write a note on thermite welding. Question 6: Why is sodium metal always stored under kerosene oil ? Answer: They tend to gain electrons and act as oxidising agents. 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. (iii) What is the use of galvanized iron ? Important Questions for ICSE Class 10 CISCE Chemistry. (b) Amalgams. Question 15: (i) (a) Give the common name of an ore, from which aluminium is extracted. Answer: (i) The gas Y, carbon dioxide and the gas Z, is carbon monoxide. A. Bauxite: B. Coke C. Cryolite D. Froth floatation E. Sodium hydroxide solution. Calamine is heated. (ii) Calcium, Copper, Lead, Aluminium, Zinc, Chromium, Magnesium, Iron,. (v) Brass [7% of Cu, 30% of Zn]. Name an ore of one of the above metals and state, how the metal is produced from it commercially by the process of: (a) Electrolysis of the molten ore (b) Reduction by coke (c) Roasting followed by reduction (d) Metal found in native state (ii) How would you prove that the alloy solder contains lead ? (b) The slag is used in the manufacture of cement. Answer: (i) Zinc sulphide [ZnS]. Metal Y, has no reaction with water but its hydroxide decomposes, with slight warming, giving a black powder. Post was not sent - check your email addresses! (b) Which gas is generally liberated when metals react with dilute acid? (iv) Iron. (2) If fused metallic chloride is electrolysed, at which electrode the metal will be obtained. (c) Lead—Galena. Get Metallurgy, Chemistry Chapter Notes, Questions & Answers, Video Lessons, Practice Test and more for CBSE Class 10 at TopperLearning. • Metallurgy comprises of 3 steps: i. Silica is reduced to Si which volatilises at the temperature of reaction. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Study class 10 Metallurgy notes & practice icse board sample papers to score good marks in exams. • 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. 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. Important ores of Aluminium: • Bauxite: Chemial formula is: Al 2 O 3. Question 2: Why are non-metals called oxidizing agents ? CaSO4.2H2O 9. Hence aluminium is not extracted by the “Blast Furnace Process”. Here you will find the chapter wise notes in pdf format practice papers and model papers. CaCO3  ⟶  CaO + CO2 (Carbon dioxide)↑ Calcium oxide combines with sand, present as impurities, to form calcium silicate known as the slag. Also see the following study notes to help you ace your ICSE Chemistry Board Exam: ICSE Chemistry: Extraction of Metals (NOTES), ICSE Chemistry: Single-page Notes for Sulphuric Acid, Quick Links: all ICSE notes and tips in one place. Get ICSE Class 10 Chemistry Book PDF Free sample by Dr. P. Bahadur from Nageen Prakashan With Instant Activation. 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. We request you to leave your feedback by giving Prateek’s notes a 1-5 star rating above and/or by writing a comment in the section below. (ii) (a) Among the above metals, write the names of metals which will displace hydrogen from water or steam. The reduction of metallic oxide inside the blast furnace. Answer: Sodium is a very reactive metal and on exposure to moist air, the surface of sodium metal is tarnished due to formation of sodium carbonate. Question 8: (i) What is bauxite ? (b) Name three raw materials used in the extraction of iron. 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 ? If it is heated in steam, a white solid A is formed and a colourless gas B is set free (1) which of the metals in the list is X ? (iii) What would you expect to happen, if aluminium metal is heated with iron (III) oxide ? (b) (1) What is the type of bonding expected in metallic chloride ? Question 3: Why iron is not found in free state in nature ? You can download the Class 10 Chemistry ICSE Textbook Solutions with Free PDF download option. • Corundum: Chemial formula is: Al 2 O 3. (iii) Non-ferrous alloys: An alloy that does not contain iron as one of its constituents, is called a non-ferrous alloy, e.g., brass. (b) Bauxite (Al2O3). Besides iron, it contains about 4% of carbon and small quantities of silicon, phosphorus, manganese and sulphur. 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. In this post, we are excited to publish the fourth in this series of single-page notes by our reader, Mr. Prateek Srivastava. (ii) Which is the zinc compound obtained by roasting zinc blende ? ICSE 10 Chemistry Metallurgy revision notes capture the essence of the chapter. (3) Non-metal graphite is good conductor of heat and electricity. Question 9: Why extraction of aluminium is difficult ? Answer: Iron is quite reactive metal, it easily combines with other metals. (2) Which metal is added to steel to make stainless steel ? Answer: (i) Caustic alkali dissolves aluminium oxide forming soluble sodium aluminate while impurities remains insoluble and ppt. (4) Write the name of the solid A and gas B. AgCl 10. (iii) (a) (1) Nickel Plating and (2) Galvanizing. MgSO4. Metallurgy 1. Answer: (i) (a) Copper (b) Zinc (c) Magnesium (d) Iron (ii) Sodium > Magnesium > Iron > Zinc > Copper. (ii) Zinc blende is oxidized to zinc oxide by roasting in presence of excess air, (iii) Reduction of zinc oxide. (b) Calamine ore is chemically zinc carbonate [ZnCO3]. (ii) (a) Among the above metals, write the names of metals which will displace hydrogen from water or steam. S + 2e– ⟶ S2 (ii) (a) When aluminium metal reacts with sodium hydroxide solution, hydrogen gas is liberated. Answer: (i) (a) (1) The metal X is sodium. Fe2O3 + 3CO » 2Fe + 3CO2↑ (c) Lime stone, at a higher temperature of blast furnace; decomposes into calcium oxide and carbon dioxide. (2) Magnesium can displace hydrogen from acids vigorously in cold but iron displaces hydrogen slowly. I’m ICSE Helper. 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) Sodium hydroxide, Question 11: (i) Give the name and formula of the ore of zinc containing its sulphide. Answer: (i) Alloys are classified on the basis of their constituents. Download Formulae Handbook For ICSE Class 9 and 10. Question 20: (i) Most of pig iron obtained from blast furnace is converted into steel. (ii) A certain metal does not liberate hydrogen from dilute sulphuric acid but it displaces silver from aqueous silver nitrate solution. Ep. ... Metallurgy. AI2O3 4. (b) Iron—Hematite. Answer: (i) Carbon (Graphite) (ii) A (iii) Aluminium oxide / Alumina / cryolite (sodium aluminium fluoride). (1) The carbonate of X. 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. 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. (ii) Give a balanced chemical equation for the above reaction. Free download of step by step solutions for class 10 Science chapter 7 - Metallurgy of ICSE Board (Concise - Selina Publishers). 16. Change ), You are commenting using your Facebook account. Keep yourself updated! Question 13: (i) The following is a list of metals : Na, Mg, Al, Zn, Fe, Pb, Cu and Au. (ii) What is the zinc compound obtained by roasting zinc blende ? (d) Gold. Question 19: (i) (a) Name two ores of iron. Formation of Hag inside the blast furnace. 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. 5. When pig iron is heated to melting and is casted into desired moulds, then it is known as cast iron. All exercise questions are solved & explained by expert teacher and as per ICSE board guidelines. (b) What is |he principal use of slag ? (ii) What is the purpose of using : (a) The coke  (b) The limestone (iii) Write the equation for the reduction reaction which produces iron. Aluminium oxide is converted into AIN which is hydrolysed with water to obtain Al(OH)3. (iii) Cryolite acts as a solvent for alumina. In 2015, she gave her Class 12 ISC Commerce board exams and scored a 97.2%. 2H20 + NaOH  ⟶  2NaAlO2 + 3H2O (iii) The name of substance is Fluorspar (CaF2) and it increases conductivity of the electrolyte. CuCO3.Cu(OH)2 7. (d) Can form +2 and +3 ions. For subject-wise notes and tips, check out our Quick Links page. (iv) Stainless steel. (ii) Ferrous alloys: It is an alloy having iron as one of the constituent, e.g., nickel, steel. Burning of aluminium in air. If you face any problem, feel free to Contact Us or leave a comment anywhere. They are lustrous, malleable, ductile and good conductors of heat and electricity. (ii) (a) Metals complete their octet by the loss of electrons whereas non-metals complete their octet by the gain of electrons. (iv) Burns away in the presence of oxygen produced or consumed. What is the name of the zinc compound in zinc blende ? Answer: Because duralumin is harder, stronger and more resistant to corrosion. (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. Why is an electrolyte able to conduct electricity while a Nonelectrolyte Cannot? APlusTopper.com provides ICSE Solutions for Class 10 Chemistry Chapter 7 Metallurgy for ICSE Board Examinations. Write the equation for this reaction. Epsom salt 11. It is a substance which is added along with charge to separate the gangue in metallurgy. Write down the missing statements (i) to (iv). Sorry, your blog cannot share posts by email. (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. (c) Aluminium is more active than iron and yet there is less corrosion of the aluminium, when both are exposed to air. (iii) What material is used for the cathode ? ... ICSE Class 10 Chemistry Metallurgy. Download eBook Reader. 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. Toll Free No. Silica is added to roasted copper ore during extraction in order to remove (a) Cuprous sulphide (b) Ferrous … 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 (lea… 15. Sodium is collected at cathode, while chlorine gas is liberated at anode; as an important by product. Question 4: Iron liberates hydrogen from dilute sulphuric acid, while silver cannot. State how zinc leaves a furnace. (b) (1) Magnesium reacts with boiling water to liberate hydrogen gas, while iron can do so with steam in red hot condition only. To get the latest notes directly in your inbox as soon as they are published, subscribe to our email newsletter if you haven’t already. (i) Write down the three letters each from the above list which are relevant to : (1) Zinc (2) Aluminium. (4) Sodium hydroxide. Fe + H2SO4 ⟶ FeSO4 + H2↑. (iii) What are the differences between a mineral and an ore ? (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. (c) What is galvanized iron and for what purposes it is used ? Thus, chapter 7 in Selina textbook for chemistry discusses this topic in great detail. Question 5: List 1 contains the metals/alloys, (i), (ii), (iii), (iv), (v) and list 2 contains their uses A, B, C, D, E. Copy and complete the following table writing down the letter for the correct use of each metal. (c) Name another metal, which is extracted by this process. (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. Reduction of copper oxide by hydrogen. Question 12: (i) (a) What is the function of adding the lime stone in the “Blast Furnace”? 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. (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. Question 10: During the extraction of aluminium, cryolite and fluorspar are added to alumina. (ii) How is the metal sodium extracted ? Metallurgy – 2
Metals are extracted from their ores. Go through it. Pig-iron is brittle in nature and cannot be welded. (3) Graphite acts as an anode. (b) State whether the following are soluble or insoluble in water. Heating of aluminium hydroxide. (iii) Fe2O3 + 3CO  ⟶  2Fe(Spongy iron) + 3CO2 (iv) Fusible slag (calcium silicate) (v) CaO + SiO2  ⟶  CaSiO3. (iii) What is the type of chemical reaction carried out in order to obtain zinc ? Zincite 6. (ii) (a) Coke acts as a reducing agent, (b) Limestone acts as a flux. hydrochloric acid. This process is known as tempering of steel and is employed for bringing the steel into a suitable state of hardness and elasticity. 8. ZnO 6. (2) Graphite, an allotrope of carbon is a good conductor of electric current. Post that, she completed her Bachelor’s in Commerce and spent the next two years working in the education sector. (c) All minerals are not ores, but all ores are minerals. (iv) Type metal. (ii) Give the function of three components of electrolyte. 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. Apart from Sample Papers, the thing which matters the most is Syllabus and marking scheme of every subject. (iii) (a) When caustic soda solution is added to a ferrous salt, a dirty green precipitate of ferrous hydroxide is obtained. What is the name of the zinc compound in zinc blende ? State how this essential step is carried out in the extraction of; (a) iron, (b) aluminium. (ii) What is the most important chemical process in the extraction of any metal ? (b) Aluminium metal is extracted by electrolytic reduction process, in which electric current is passed through fused aluminium oxide, the purified Bauxite. Purified ore is roasted in a reverberatory furnace, where it is decomposed to form zinc oxide and carbon dioxide gas is liberated. Ep.2: Ten Important Last Minute Instructions before the ICSE 2019 Board Exams, Follow Helpline for ICSE Students (Class 10) on WordPress.com. Iron thus occurs in nature in the form of its compounds and not as a free element. More one-page Chemistry notes by Prateek coming up. Galena 3. Corundum 4. (b) Brass. ICSE 10 Chemistry > Metallurgy Question Papers Revision Notes Take Quizzes Solve Worksheets Select a Chapter from the menu to view the specific chapter C + O2  ⟶  CO2 Or  2O2- – 4e–  ⟶  O2 Thus, electrodes are made of graphite. (iii) Galvanized iron is used in making different varieties of tools for industries, scientific apparatus, and household fittings. (ii) What are ferrous alloys ? (II) Aluminium is a good conductor of electricity, light in weight, tough and possess high tensile strength and is resistant to corrosion. Answer: Question 2: Complete and balance the following equations : Answer: Question : Give the chemical formulae of the following naturally occuring ores: 1. On the other hand, ferric salts give a reddish brown precipitate of ferric hydroxide with caustic soda. 10. (v) Brass. (iv) Pig iron and slag are the two products, which are taken out from the blast furnace during the extraction of iron. Organic Chemistry I. 7H2O 11. They lie just above and below hydrogen in activity series of metals. (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. Physical Properties of Metals and Non-Metals Metals are electropositive in nature. By which chemical process is the amount of carbon decreased to make steel ? Question 7: Why carbon can reduce copper (II) oxide to copper but not calcium oxide to calcium ? (ii) Take the given sample of solder and dissolve it in concentrated nitric acid. (ii) The rusting of iron is a process of atmospheric corrosion, i.e., slow destruction of iron by moisture and atmospheric oxygen. (ii) Aluminium and magnesium. Carbon monooxide is regenerated. C + O2  ⟶   CO2 CO2 + C  ⟶  2CO (b) Carbon monoxide so produced, reduces haematite ore [Ferric oxide] to metallic iron. Rust is a reddish-brown powdery deposit and consists of a mixture of ferric hydroxide and hydrated ferric oxide. (b) Which of these is most likely to be found in free state in nature ? This process is termed as boldschmidts aluminothermic process. So, a large amount of energy is needed to maintain this high temperature. (v) “Iron is removed from a blast furnace as a liquid”. (1) A car bumper and (2) A food can. C + O2  ⟶  CO2 (iii) In the modern method, pure alumina is dissolved in cryolite [Na3.AlF6], which makes it good conductor of electricity. Answer: (i) (a) Haematite (Fe2O3). The extraction of metals from their ores and then refining them for use is known as metallurgy; Steps involved in Extraction of metals from ore include ... ICSE Grade 10; Chemistry; India CBSE. (b) Sulphur is non metal because, it gives negative sulphur ions by gaining of two electrons. (b) Iron ore, lime stone, and coke are used in the extraction of iron. Question 5: Zinc displaces lead from lead nitrate solution, while gold is unable to do so. This arrangement of metals in a series is called electrochemical or metal activity series. (b) The following questions relate to the extraction of aluminium by electrolysis : (1) Give the equation for the reaction that takes place at the cathode. A burning Mg riboon is inserted into the ignition mixture, which catches the fire and ignite the thermite. (iii) Copper and Tin. (iii) Reduction of zinc oxide. Bauxite is chemically known as hydrated aluminium oxide. It’s great .And give the final edge by doing past 10 year chemistry question papers . This will clear students doubts about any question and improve application skills while preparing for board exams. 2H2O]. (iii) Aluminium is cheaper than copper. 1800-102-5301 (4) The name of the solid A is magnesium hydroxide, while the gas B is hydrogen. To this solution add potassium chromate solution, a golden yellow precipitate, confirms the presence of lead. On the top of the thermite mixture, an irgnition mixture of potassium chlorate and magnesium powder is placed. Reduction of ferric oxide by aluminium powder. It also increases conductivity alongwith fluorspar. (ii) It is a good conductor of electricity. (vi) It is an alloy of aluminium, copper, magnesium and manganese and is used for making aeroplanes, space crafts, sea ship and pressure cookers. PbS 3. Slag is calcium silicate with the formula CaSiO3. Answer: (i) (a) Two main ores of iron are : Haematite [Fe2O3] and Magnetite [Fe2O4]. Question 22: The following substances are put into the blast furnace while manufacturing iron : Iron ore, coke, limestone and hot air. Horn silver 10. Gypsum 9. Fluorspar (CaF2) acts as a solvent and increases the conductivity of electrolytic mixture. Class 10 Class 12 Name this process. Enter your email address to follow us and receive notifications of new posts by email. Answer: (i) (a). (ii) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. (ii) It is an alloy of copper, zinc and tin and is used for making statues, utensils and coins. Bauxite and aluminium ore contains impurities of FeO and SiO2. (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. Why ? Coke + O2  ⟶  Gas Y Gas Y + Coke  ⟶  Gas Z Gas Z + Iron oxide  ⟶  Gas Y + Iron Identify the gases, Y and Z. (b) Give two uses of slag. They are classified as follows: (a) Ferrous alloys. Zinc reacts with lead nitrate solution to precipitate lead and zinc nitrate is formed. (c) (1) Cast iron contains about 4% of carbon. Choose the major metals from the list given above to make the following alloys: (a) Stainless steel. 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. There’s one book called concise chemistry , published by Selina , don’t know if they still use it , But if you can get it or already have it , just go for it . (ii) A good amount «f the aluminium vaporises at this temperature. Answer: Because carbon has greater affinity for oxygen than copper and less affinity for oxygen than calcium. You can further filter Important Questions by subjects and topics. For more information, please contact us or go through our copyright policy. Answer: (i) Aluminium is lighter than copper. (iii) (a) The minerals contain a low percentage of metal, while the ores contain a large percentage of the metal. Aluminium is collected at the cathode. CaCO3.MgCO3 5. (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) Answer the following question related to above (i) sequence : (a) Which of these is most likely to tarnish readily when exposed to the air ? 12. Give a reason fdr your answer and deduce whether the element X would be expected to have oxidizing or reducing properties. Answer: In moist air, a thin layer of aluminium oxide is formed on it quickly which protects aluminium to oxidise. Give the names of the following metals : (i) A metal commonly used for preventing rusting of iron. Currently, she is practicing physical distancing while pursuing an MBA course and praying for everyone’s health and wellbeing. Aluminium is the most abundant metal in the earth’s crust, where it is found in the form of hydrated oxides like bauxite. 3: I’ve Lost My Motivation to Study. During roasting, chemical changes like oxidation or reduction take place. 3Fe + 4H20  ⟶  Fe3O4 + 4H2↑ (4) Lead and copper almost fail to liberate hydrogen gas in any conditions, because they are not so reactive.