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Metal and Metallurgy

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Metal and Metallurgy

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  2. Welcome to West Bengal’s 1st Learning Mate For More Live Class & PDF  https://www.yuvaplus.in yuvaplus Subscribe Our Youtube Channel:

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  5. METAL AND METALLURGY PART-5 For More Live Classes & PDF https://www.yuvaplus.in

  6. Copper Atomic no - 29 Mass no - 64 Occurance and extraction: Copper occurs in nature in the form of metal as well as in the form of its ores. In the form of ores it is found as copper pyrites(CuFeS2), Copper glance(Cu2S), Cuprite(Cu2O) etc. It is a transition element and used in making utensils, alloys, electrical wires and coins, so it also called coinage metal. This is mainly extracted from copper pyrites by means of self reduction process Properties: This is a tough reddish colour metal. It is malleable and ductile. This is a good conductor of heat and electricity. At ordinary temp it does not react with dry air, but in moist air it forms basic carbonate slowly and steadily. It does not react with dil HCl but reacts with Conc HCl and Cupric Chloride(CuCl2) is formed For More Live Classes & PDF https://www.yuvaplus.in

  7. AlloysCompositionUses Brass Cu(70%) Zn(30%) household utensils, idols Bronze Cu(88%), Sn(12%) coins, idols, bells, utensils German silver Cu(60%), Zn(25%), Ni(15%) idols, utensils Bell metal Cu(80%), Sn(20%) bells, utensils, idols, coins Gun metal Cu(88%), Sn(10%), Zn(2%) engineering goods, gun parts or equipments of machine Dutch metal Cu(80%) Zn(20%) cheap ornaments due to its golden yellow colour For More Live Classes & PDF https://www.yuvaplus.in

  8. Compounds: 1. Cupric sulphate(CuSO4): This is the main compound of copper it is also called blue vitriol(CuSO4.5H2O). This is basically a solid crystalline substance of blue colour in water. It is a poison and that’s why it is used as a germicide or an insecticide. A mixture of CuSO4.5H2O and Ca(OH)2 is called bordeaux mixture and it is used as a fungicide. 2. Cupric chloride(CuCl2.2H2O): This is a green crystalline solid soluble in nature. It is a covalent compound and its solution is acidic in nature because it is a normal salt of weak base(CuO) and strong acid(HCl). When it is heated at 150degree it becomes dehydrated. For More Live Classes & PDF https://www.yuvaplus.in

  9. Cuprous oxide(Cu2O): This is a red colour solid substance, insoluble in water. It is used in making ruby glass and in manufacturing of dyes • White bronze: The bronze in which there is an excess amount of tin(Sn) with copper is called white bronze • Feshling’s solution:This is a deep blue solution obtained by dissolving CuSO4.5H2O solution in water by adding sodium potassium tartarate solution to it and making the resulting solution alkaline with NaOH. This is used to examine an aldehyde. For More Live Classes & PDF https://www.yuvaplus.in

  10. Silver Atomic no-47 Mass number 108 D-block element(coinage metal) Occurance and extraction: It occurs as a metal in nature as well as in the forms of ores. There are various ores of silver like argentile(Ag2S), horn silver(AgCl) etc. Almost all silver is extracted from argentile(Ag2S) ore by Mac Arthur Cyanide process Properties: This ios a white shining solid metallic substance., malleable and ductile. This is the best conductor of heat and electricity. Dry and H2S free air has no action on silver, But when exposed to air, it slowly turns For More Live Classes & PDF https://www.yuvaplus.in

  11. Blackish due to formation of Ag2S on its surface by the action of H2S present in air. It does not react with any base and hydrochloric acid. • Uses: Silver is used in making ornaments, utensils, coins, silver pt alloy, in filling tooth cavities, silver plating etc. • Compounds: • Silver chloride(AgCl): This is also called Horn silver which is frequently used in making photochromatic glass • Silver bromide(AgBr): It is used in photography • Silver iodine(AgI): It is used in producing artificial rains • Silver nitrate(AgNO3): This is the main compound of • silver and it is also called Lunar Caustic. This is • kept inside the coloured bottle because it • decomposes For More Live Classes & PDF https://www.yuvaplus.in

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