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The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blacke... 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas... 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it ... 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products C is metal and settles down ... 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air. (a) Name the metal and write its chemical symbol. (b) Write the name and formula of the sulphide ore. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Which metal is extracted from calamine ore? (b) Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Name the metal which is extracted from the ore called ‘rock salt’. (b) Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Which metal is extracted from bauxite ore? (b) Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Name the metal which is extracted from haematite ore. (b) Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh What is the difference between a mineral and an ore? (b) Which metal is extracted from cinnabar ore? (c) Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Name two metals which are found in nature mainly in the free state (as metallic elements). (b) Name two metals which are always found in combined states. (c) What iron compound is present in hematite ore? Also, write its chemical formula. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process? (b) Name the chemical compound which is electrolysed in molten state to obtain sodium metal. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh (a) For the reduction of a metal oxide, suggest a reducing agent other than carbon. (b) Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal. 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Explain giving equation, what happens when: (a) ZnCO3 is heated in the absence of air? (b) a mixture of CU2O and CU2S is heated? 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh How does the painting of an iron object prevent its rusting? (b) How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper? 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Name an alloy of copper. State its chemical composition and anyone use. (b) Explain why, when a copper object remains in damp air for a considerable time, a green coating is formed on its surface. What is this process known as? 3 years ago Jaiyush19 class 10 metals non metals lakhmir singh Page 1 / 5 1 2 3 4 5 Next Share: Super Globals Requests: Server: Options and Features route: community use_home_url: url: https://eanshub.com/community/ pageid:187 default_groupid: 3 2022 How Can We Help? Δ Home About Us Contact Us Privacy Policy Term of Use Copyright © 2020 Eanshub All Rights Reserved
