Group A Good Earth School Naduveerapattu Chemistry Worksheet Class X Metallurgy (1) Name a metal which has the following properties.

Transcription

1 Group A Good Earth School Naduveerapattu Chemistry Worksheet Class X Metallurgy (1) Name a metal which has the following properties. 1. Is a liquid at ordinary temperatures. 2. Has a low boiling point but does not float on water. 3. Is a light, soft metal which can be cut with a knife. 4. Does not give a note on striking. Metal (2) Name a non-metal which has the following properties. 1. Volatizes at low temperatures and burns in air with a pale blue flame. 2. Has a very high density. 3. Conducts electricity and is lustrous. 4. Does not conduct electricity but is lustrous. Non-metal (3) Differentiate between the following terms used in metallurgy. (a) Mineral and Ore. (b) Metallurgy and Electrometallurgy. (c) Roasting and Calcination. (4) Give reasons for the following: (a) It is necessary to remove the impurities like iron oxide and silica from the bauxite ore before conducting the electrolytic reduction of the fused alumina. (b) Electrolytic reduction of pure alumina is difficult to conduct at the fusion temperature of alumina. (c) Fused cryolite is added to the electrolyte which assists electrolytic reduction in addition to lowering the fusion temperature of the mixture. (d) A layer of powdered coke is sprinkled over the electrolytic mixture during electrolytic reduction. (5) With reference to the physical and chemical properties of metals and nonmetals (a) The metal which has a low melting point is [Mg/K/Cu/Fe]. (b) The metal which can be cut with a knife is [Cu/Al/Na/Zn]. (c) The non-metal present in the alloy stainless steel is [P/S/C]. (d) The metal whose cation is discharged at the cathode by accepting two electrons from the cathode is [Na/K/Mg/Al]. (e) The non-metal whose oxide is a neutral oxide - [sulphur / nitrogen / phosphorus].

2 (6) Complete the table below with balanced equations for extraction of aluminium from its ore bauxite by the Baeyer s and Hall Heroult s processes.

3 (7) The Diagram below represents Goldschmidt s thermite welding process. (a) State the composition of the mixture X. (b) State the function of Y in the above diagram. (c) State the function of aluminium in the mixture X. (d) Give a balanced equation for the conversion of iron [III] oxide to iron. (8) With reference to the activity series of metals- (a) The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is [Al/Cu/Zn/Fe]. (b) The metal whose hydroxide does not decompose on heating but its nitrate decomposes is [Ca/Al/Na/Fe]. (c) The metal whose carbonate and nitrate on thermal decomposition give a residue which is a metal [Fe/Cu/Ag/Ca]. (d) The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is [Al/Na/Mg/K]. (e) The metal whose oxide which is amphoteric is reduced to metal by carbon reduction is [Fe/Cu/Zn/Al]. (9) The sketch below illustrates the refining of aluminium by Hoope s process. A B (i) (ii) (iii) (iv) Which of A and B is the cathode and which one is the anode? What is the electrolyte in the tank? What material is used for the cathode? Give the electrolytic reaction

4 Group B Good Earth School Naduveerapattu Chemistry Worksheet Class X Metallurgy (1) Name a metal which has the following properties. 1. Is found in the native state in nature. 2. Is brittle at ordinary temperatures. 3. Is divalent and forms a white amphoteric oxide. 4. Has variable valency and forms a black basic oxide. Metal (2) Name a non-metal which has the following properties. 1. Has lustre but does not sublime on heating. 2. Has a high melting point. 3. Is present in the alloy stainless steel. 4. Is liquid at ordinary temperatures. Non-metal (3) Differentiate between the following terms used in metallurgy. (a) Mineral and Ore. (b) Metallurgy and Electrometallurgy. (c) Roasting and Calcination. (4) Give reasons for the following: (a) It is necessary to remove the impurities like iron oxide and silica from the bauxite ore before conducting the electrolytic reduction of the fused alumina. (b) Electrolytic reduction of pure alumina is difficult to conduct at the fusion temperature of alumina. (c) Fused cryolite is added to the electrolyte which assists electrolytic reduction in addition to lowering the fusion temperature of the mixture. (d) A layer of powdered coke is sprinkled over the electrolytic mixture during electrolytic reduction. (5) With reference to the physical and chemical properties of metals and nonmetals (a) The metal which has a low melting point is [Mg/K/Cu/Fe]. (b) The metal which can be cut with a knife is [Cu/Al/Na/Zn]. (c) The non-metal present in the alloy stainless steel is [P/S/C]. (d) The metal whose cation is discharged at the cathode by accepting two electrons from the cathode is [Na/K/Mg/Al]. (e) The non-metal whose oxide is a neutral oxide - [sulphur / nitrogen / phosphorus].

5 (6) Complete the table below with balanced equations for extraction of aluminium from its ore bauxite by the Baeyer s and Hall Heroult s processes.

6 (7) The Diagram below represents Goldschmidt s thermite welding process. (a) State the composition of the mixture X. (b) State the function of Y in the above diagram. (c) State the function of aluminium in the mixture X. (d) Give a balanced equation for the conversion of iron [III] oxide to iron. (8) With reference to the activity series of metals- (a) The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is [Al/Cu/Zn/Fe]. (b) The metal whose hydroxide does not decompose on heating but its nitrate decomposes is [Ca/Al/Na/Fe]. (c) The metal whose carbonate and nitrate on thermal decomposition give a residue which is a metal [Fe/Cu/Ag/Ca]. (d) The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is [Al/Na/Mg/K]. (e) The metal whose oxide which is amphoteric is reduced to metal by carbon reduction is [Fe/Cu/Zn/Al]. (9) Match the properties and uses of alloys. 1. The alloy contains Cu and Zn, is hard, silvery and is used in decorative articles. 2. It is stronger than aluminium, light and is used in making light tools. 3. It is lustrous, hard, corrosion resistant and used in surgical instruments. 4. Tin lowers the melting point of the alloy and is used for soldering purpose. 5. The alloy is hard, brittle, takes up polish and is used for making statues. (a) Duralumin (b) Brass (c) Bronze (d) Stainless steel (e) Solder

7 Group C Good Earth School Naduveerapattu Chemistry Worksheet Class X Metallurgy (1) Name a metal which has the following properties. 1. Is neither malleable nor ductile at particular temperatures. 2. Forms an alloy which is a liquid at ordinary temperatures. 3 Has a low density but does not float on water. 4. Is a soft metal whose oxide is amphoteric. Metal (2) Name a non-metal which has the following properties. 1. Forms a gaseous poisonous neutral oxide and a gaseous acedic oxide which turns lime water milky. 2. Forms a gaseous neutral oxide and a gaseous coloured acidic oxide. 3. Forms a neutral oxide, liquid at ordinary temperature. 4. Forms a volatile chloride, liquid at ordinary temperatures. Non-metal (3) Differentiate between the following terms used in metallurgy. (a) Mineral and Ore. (b) Metallurgy and Electrometallurgy. (c) Roasting and Calcination. (4) Give reasons for the following: (a) It is necessary to remove the impurities like iron oxide and silica from the bauxite ore before conducting the electrolytic reduction of the fused alumina. (b) Electrolytic reduction of pure alumina is difficult to conduct at the fusion temperature of alumina. (c) Fused cryolite is added to the electrolyte which assists electrolytic reduction in addition to lowering the fusion temperature of the mixture. (d) A layer of powdered coke is sprinkled over the electrolytic mixture during electrolytic reduction. (5) With reference to the physical and chemical properties of metals and nonmetals (a) The metal which has a low melting point is [Mg/K/Cu/Fe]. (b) The metal which can be cut with a knife is [Cu/Al/Na/Zn]. (c) The non-metal present in the alloy stainless steel is [P/S/C]. (d) The metal whose cation is discharged at the cathode by accepting two electrons from the cathode is [Na/K/Mg/Al]. (e) The non-metal whose oxide is a neutral oxide - [sulphur / nitrogen / phosphorus].

8 (6) Complete the table below with balanced equations for extraction of aluminium from its ore bauxite by the Baeyer s and Hall Heroult s processes.

9 (7) The Diagram below represents Goldschmidt s thermite welding process. (a) State the composition of the mixture X. (b) State the function of Y in the above diagram. (c) State the function of aluminium in the mixture X. (d) Give a balanced equation for the conversion of iron [III] oxide to iron. (8) With reference to the activity series of metals- (a) The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is [Al/Cu/Zn/Fe]. (b) The metal whose hydroxide does not decompose on heating but its nitrate decomposes is [Ca/Al/Na/Fe]. (c) The metal whose carbonate and nitrate on thermal decomposition give a residue which is a metal [Fe/Cu/Ag/Ca]. (d) The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is [Al/Na/Mg/K]. (e) The metal whose oxide which is amphoteric is reduced to metal by carbon reduction is [Fe/Cu/Zn/Al]. (9) The following figure shows an electrolytic cell used in the extraction of aluminium. (a) What is the substance of which the electrodes A and B are made? (b) At which electrode (A or B) is the aluminium formed? (c) What are the two aluminium compounds in the electrolyte C? (d) Why is it necessary for electrode B to be continuously replaced?