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Sourav Sir, M: 8972624998, , Metallurgy I, 1. Give the names of the following metals :, (i) A metal that is in a liquid state at room temperature., (ii) A metal that dissolves in cold water to form a turbid solution with the liberation of, hydrogen gas. Support your answer with a chemical equation., (iii) A metal that catches fire when brought in contact with air or water., (iv) A metal that burns with a non-persistent green flame in air or oxygen., (v) A metal that forms two different cations, , 2. Give the names of the non-metals which exhibit the following properties :, (i) A non-metal having lustre and is a good conductor of electricity., (ii) A non-metal, which is the hardest naturally occurring substance., (iii) Two non-metals whose oxides are neutral towards litmus., (iv) A non-metal that is liquid at room temperature., (v) A non-metal that is kept underwater., (vi) A non-metal that is essential for organic compounds., (vii) A non-metal that is essential for respiration., (viii) A non-metal that is essential for producing steel., (ix) A non-metal which is the source of energy in the sun and stars., (x) A non-metal that is used in the purification of drinking water., (xi) A non-metal used for curing skin diseases., 3. Name a metal from the activity series that:, (i) forms an oxide on exposure to air,, (ii) displaces hydrogen from steam,, (iii) does not react with HCl or H2SO4, (iv) forms an oxide or hydroxide soluble in water, (v) forms a nitrate and on thermal decomposition leaves a metallic residue. Give balanced, equations wherever possible., , 4. State, (i) composition, (ii) reason for alloying, (iii) one use the following alloys, a) Stainless steel, b) Brass, c) Type metal, d) Bronze, e) Solder, f) Gun metal, g) German silver, h) Magnalium, i) Bell metal, j) Duralumin, 5. Complete the statements given below pertaining to the chemical properties of metals with correct, words. If ‘M’ is a metal :, (i) Its compound MY2 is ___________ [electrovalent/covalent]., (ii) It will form cation M2+ by electron ___________ [gain/loss] and the metal M is ___________, [oxidised/reduced]., (iii) The cation M2+ form metal M by ___________ [loss/gain] of two electrons., (iv) The oxide of metal MO is a/an ___________ [acidic/basic/neutral] oxide., (v) M is ___________ [less/more] electropositive than hydrogen and can replace the ___________, [hydrogen/chlorine] ion in hydrochloric acid to form a salt., , 1

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Sourav Sir, M: 8972624998, , 6. Complete the statements given below pertaining to the chemical properties of nonmetals with correct words. If ‘N’ is a non-metal., I., II., III., IV., V., , it will form anion N1– by electron ________ [gain/loss] and non- metal N is ___________, [oxidised/reduced]., its oxide is an/a ___________ [acidic/basic/amphoteric] oxide., its anion N1– will form neutral atom at the ___________ [cathode/anode], its valence shell will have ___________ [1/7/2] electron/electrons., it is highly electronegative and a ___________ [bad/good] conductor of heat., , 7. Complete the statement given below pertaining to group IA metal., (i) Its electronic configuration is 2, 8, 1 and it belongs to period _________ of periodic table [1/2/3]., (ii) It is highly electropositive metal, since it has a strong tendency to ___________ [gain/lose] electrons., (iii) It is a ___________ [light/heavy] metal, since it has a ___________ [small/larger] atomic size and, ___________ [low/high] density., (iv) It is a ___________ [soft/hard] metal, since energy binding the atoms is ________ [high/low], (v) It is a strong ___________ [oxidising/reducing] agent and has __________ [high/low] ionisation, potential., , 8. Complete the statements given below pertaining to the physical/chemical properties of, metals and non-metals., (i) The metal which has low melting point is _______ [Mg/K/Cu/Fe]., (ii) The metal which can be cut with a knife is ______ [Cu/Al/Na/Zn]., (iii) The non-metal present in the alloy stainless steel is ______ [P/S/C]., (iv) The metal whose cation is discharged at cathode by accepting two electrons from the cathode is, ______ [Na/K/Mg/Al]., (v) The non-metal whose oxide is a neutral oxide ______ [S/N/P]., , 9. Complete the statements pertaining to the metal activity series with correct words., (i) The metal which does not react with water or dilute sulphuric acid, but reacts with concentrated, sulphuric acid is ______ [Al/Cu/Zn/Fe]., (ii) The metal whose hydroxide does not decompose on heating, but its nitrate decomposes is ______, [Ca/Al/Na/Fe]., (iii) The metal whose carbonate and nitrate on thermal decomposition give a residue which is a metal, ______ [Fe/Cu/Ag/Ca], (iv) The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is ______, [Al/Na/Mg/K]., (v) The metal whose amphoteric oxide which is amphoteric is reduced to metal by carbon reduction is, ______ [Fe/Cu/Zn/Al]., , 10. Fill in the statements given below with correct words pertaining to alloys., I., II., III., IV., V., VI., VII., VIII., IX., X., , The metal other than aluminium present both in magnalium and duralumin is _________, [copper/manganese/magnesium]., The metals zinc and tin are present in _________ [both brass and bronze/only brass/only, bronze/bell metal], German silver contains _________ [Cu-Zn-Sn/Cu-Zn-Ni/Cu-Pb-Ni], Electrical fitting are generally made of _________ [germen silver/bell metal/brass], An alloy which is sonorous is _________ [duralumin/type metal/bell metal]., The major metals which make alloy type metal are _________ [tin, antimony and lead/tin and, antimony/lead, tin and carbon], Addition of _________ [antimony/tin] to lead lowers the melting point of the alloy solder., Gun metal is an example of a/an _________ [lead alloy/copper alloy/aluminium alloy], The non-metallic component in stainless steel is _________ [sulphur /phosphorus/ carbon], Stainless steel contains in addition to iron, nickel and chromium which imparts _________, [hardness/tensile strength/lustre] to the alloy., , 11. Select the correct answer from the choices A, B, C and D., (i) A metal that has a large atomic size and is light in weight., (a) aluminium (b) lithium (c) zinc (d) copper, , 2

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Sourav Sir, M: 8972624998, , (ii) A metallic oxide which is reduced to metal by electrolysis., (a) silver oxide (b) magnesium oxide (c) copper oxide (d) iron(III) oxide, (iii) A non-metal with a lustre, which conducts electricity, (a) sulphur (b) silicon (c) graphite (d) iodine, (iv) A metal which does not react with dilute sulphuric acid, (a) magnesium (b) aluminium (c) zinc (d) copper, (v) A neutral oxide, (a) nitrous oxide (b) nitrogen dioxide (c) copper (II) oxide (d) carbon dioxide, , 12. Match the properties/uses of metals/alloys in column A with column B., Column A, (i) Heavy in weight and used in radiation shields and making bullets, (ii) Lustrous, corrosion resistance and used for making surgical instruments., (iii) Stronger than aluminium and used for making light tools., (iv) Contains copper and zinc, is silvery and used for making decorative articles, (v)Easily cast, expands on solidification and used for making pipes., Column B, (a) Brass (b) German silver (c) Pig iron (d) Stainless steel (e) Lead metal (f) Duralumin, , 13. Name :, (i) one metal that is found free or native in nature., (ii) one metal whose oxide can be reduced to metal by hydrogen or carbon monoxide., (iii) one metal which is extracted by electrolysis of its fused chloride., , 14. (a) (1) Place the following metals in the order in which they appear in the activity series,, starting with most reactive first: lead, sodium, iron, zinc., (2) A fifth metal M reacts slowly with cold water, but vigorously when heated with steam. It reacts, with dilute hydrochloric acid giving hydrogen gas and forming the chloride MCl2., (i) Where M should be placed in the activity series of four metals in (A) above?, (ii) Write an equation for the thermal decomposition of carbonate of M., (iii) How can metal M be extracted?, (b) Give two uses of zinc., (c) What is the name of gas evolved in each of the following cases?, (i) When zinc is treated with dilute sulphuric acid., (ii) When zinc is heated with concentrated sulphuric acid. [1], (d) How will you identify the gas evolved in c (ii)?, 15. (a) Explain briefly how would you obtain copper from a solution of copper (II)sulphate, (NOT by electrolysis)., (b) Name a metal whose hydroxide is a weak base., (c) What is an alloy?, (d) Name a magnesium alloy used in aircraft construction., 16. (a) Write one important use and the physical property on which the use depends for the, following metals :, (i) Aluminium, (ii) Lead, (iii) Iron., (b) In each case given below, name a metal produced commercially by the process of, (1) Electrolysis of molten ore, (2) Reduction by coke., 17. From the knowledge of activity series, name a metal :, (i) Which reacts readily with cold water to displace hydrogen., , 3

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Sourav Sir, M: 8972624998, , (ii) Which displaces hydrogen from dilute sulphuric acid or hydrochloric acid. (iii) whose hydroxide is a, strong base., (iv) whose carbonate does not decompose on heating., (v) which displaces iron from iron (III) oxide or ferric oxide, , Metallurgy II, 1. Give the names of the following metals :, I., II., III., IV., , A metal commonly used for preventing rusting of iron., Two metals which can be prepared by electrolysis from their fused chlorides, A metal which when alloyed with aluminium makes it as hard as steel, A metal whose oxide can be reduced by aluminium powder. Support your answer by a chemical, equation., , 2. Name the (i) carbonate ores, (ii) sulphide ores of the following metals, a), b), c), d), , zinc, lead, copper, iron., , 3. Define the following terms :, (i) mineral, (ii) ore, (iii) gangue, (iv) metallurgy, 4. (i) What do you understand by the term concentration of ore?, (ii) Name three processes used for the concentration of ore and name one specific ore which can be, concentrated by the named process., 5. (i) What do you understand by the term calcination?, (ii) What is the importance of calcination in the extraction of metals?, 6. (i) What do you understand by the term roasting of ore?, (ii) What is the importance of roasting in the extraction of metals?, , 7. Name the process used and the reducing agent employed for the extraction of, a., b., c., d., , aluminium from aluminium oxide, iron from haematite, chromium from chromium oxide, lead from lead sulphide., , 8. Give the chemical formulae of the following naturally occurring ores:, (i) Cryolite, (ii) Galena, (iii) Corundum, (iv) Dolomite, (v) Zincite, (vi) Malachite, (vii) Cinnabar, (viii) Gypsum, (ix) Horn silver, (x) Epsom salt., , 9. Differentiate between a mineral and ore?, 4

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Sourav Sir, M: 8972624998, , 10. Give the (i) common name, (ii) chemical formula and (iii) chemical name of two ores, each of, Metal, common name, chemical formula, chemical name, Aluminium, Zinc, Iron, 11. State two uses each of, (i) pig iron, (ii) mild steel, (iii) hard steel., , 12. Complete the statements pertaining to the extraction of aluminium., (i) The impurity which separates out on the addition of conc. solution of alkali to impure bauxite is ______, [PbO/Fe2O3/CuO/ZnO], (ii) The conversion of aluminium hydroxide to pure alumina is carried out by _______________ [addition of, Al(OH)3 crystals/thermal decomposition/precipitation]., (iii) Addition of cryolite in the molten state to alumina ______ [lowers/raises] melting point of mixture., (iv) During electrolytic reduction of alumina, Al3+ ions are discharged at cathode in preference to ______, [Na+/Zn2+ /Fe2+] ions., (v) During electrolytic reduction of alumina, the inert electrode is ______ [reduced/oxidised] to a neutral, gas., , 13. With reference to properties of metals fill the statements with correct words, (i) Aluminium powder is a constituent of paints and prevents _____________ [conduction of electric, current/formation of rust/heat radiation]., (ii) Aluminium is utilized in cooking utensils, since it is ___________ [good conductor of heat/good, conductor of electricity/ shiny in appearance]., (iii) Transmission wires are made of aluminium, since aluminium is _________ [corrosion resistant/good, conductor of heat/good conductor of electricity]., (iv) Aluminium is an important constituent metal in duralumin since it is _________ [a good condctor of, heat/light in weight/unacted by acids]., (v) A thermite mixture contains iron(III) oxide and aluminium in which _________ [aluminium/iron(III) oxide], is higher in ratio in the mixture., (vi) In a thermite mixture, aluminium _________ [oxidises/reduces] iron (III) oxide., (vii) Zinc is used in galvanising, since iron forms Fe2+ ions _________ [less/more] readily than zinc., (viii) In a dry cell the zinc container acts as _________ [anode/cathode]., (ix) _________ [pig iron/steel] is used in machine parts due to its _________ [low/high] tensile strength., (x) __________ [pig iron/steel] is used in the manufacture of gutter, , 14. Name the substance labelled from A to J which are reactants for the products formed., Also write fully balanced chemical equations., (i) Impure bauxite A⎯⎯→ Sodium aluminate., (ii) Sodium Aluminate B⎯⎯→ Aluminium hydroxide, (iii) Aluminium C⎯⎯→ H2 gas. [C is an acid], (iv) Aluminium D⎯⎯→ SO2 gas. [D is an acid], (v) Aluminium E⎯⎯→ Potassium aluminate, (vi) Aluminium F⎯→ Iron, (vii) Iron G⎯→ Iron (III) chloride, (viii) Iron (III) chloride H⎯⎯→ Iron (II) chloride, , 5

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Sourav Sir, M: 8972624998, , (ix) Zinc I⎯⎯→ Potassium zincate, (x) Iron J⎯⎯→ Iron (II) sulphide., , 15. Name the following:, (i) Two metals rendered passive by conc. or fuming nitric acid., (ii) A metal other than zinc that displaces copper from copper (II) sulphate, (iii) A metal present in sodium amalgam, other than sodium., (iv) A form of iron that contains 0.1% to 0.5% impurity and is used for making nut and bolts., (v) A metal other than manganese is present in duralumin., 16. (a) State two large-scale uses of :, i. zinc, ii. aluminium., (b) Compare cast iron and wrought iron with regard to:, (i), one physical property, (ii), chemical composition., (c) State one method of preventing rusting of iron., , 17. Metallic elements occur in the earth’s crust, combined with non-metallic elements., After suitable treatment, the compounds are reduced to produce the metals., (i) Name two naturally occurring compounds of metals and give their formulae., (ii) What is galvanised iron and for what purpose is it used?, , 18. (a) Answer the following questions :, (i) When aqueous iron (III) chloride and aqueous caustic soda are mixed, the colour of precipitate is, __________ due to the formation of __________., (ii) Name two elements whose hydroxides are very soluble in water and produce alkaline solutions., (iii) Name one metal that forms more than one type of positive ions., (iv) Name one ion responsible for the blue colour of an aqueous solution of copper sulphate., (v) When a certain gas is passed over heated cupric oxide, the products formed are copper, nitrogen and, steam. Name the gas and write a balanced equation., , (b) Metals may be obtained from their ores by various methods depending upon their, position in the electrochemical series. The methods which may be employed to extract, metals include:, A— Electrolysis of molten ore., B—Reduction of ore with carbon in a furnace., C—Physical separation from rock in which metal occurs native., (i) Which method A, B or C would be used for the extraction of (1) Copper (2) Magnesium (3) Iron?, (ii) What type of chemical process is common to both methods as given in A and B? Give a reason for your, statement., iii) What elements are added to iron in a controlled amount in order to produce stainless steel?, (iv) State two conditions that promote rusting of iron., 19. State two differences between steel and pig iron., 20. State two uses each of cast iron and steel., 21. (a) In industry, certain metals are extracted from their oxides by heating with carbon in the from of, coke. Give the name of one such metal., (b) Give the name of a metal which will evolve hydrogen when warmed with hydrochloric acid and with, aqueous sodium hydroxide solution., (c) Most of the pig iron obtained from blast furnace is converted into steel. Suggest a reason for this., (d) Describe three changes which you would observe, if excess of powdered zinc were added to copper (II), sulphate and well stirred, with a thermometer., , 6