By Chander, Jagdish; Kumar, Anil
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Extra resources for A comprehensive text book of applied chemistry
10. 15. 20. 25. 30. 35. 40. 45. 50. 55. 60. 65. 70. 75. 80. 85. d c c b b c a d b b b a d a c c c /45/ Chapter 2 FUELS INTRODUCTION Anything that burns gives off heat. Wood, coal, paper and LPG are combustible substances which produce heat on burning. However, all combustible substances cannot be called fuels. Hence a fuel is a combustible substance that can be used to produce heat at a reasonable cost. Fuels contain potential energy that is locked within the chemical bonds of their constituent molecules, when they are burnt, a large part of this energy is released as heat.
The following changes take place during the process. a) b) Moisture is de riven away Impurities like S,P, As etc. des. 6/ c) Copper pysite is decomposed and both Cu2S and FeS are partially oxidised . 2 CuFeS2+02 ~ Cu2S+2FeS+S02 t 2FeS+302 ~ 2FeO+2S02t 2Cu2S+302~ 2Cu 20+2S02 t 3) Smelting - The roasted ore is now mixed with some sand and coke and is heated strongly in a blast furnace. A blast of hot air is led into the furnace from bottom. During smelting the following changes take place. a) Most of FeS present in the ore converted into ferrous oxide which forms slag with sand.
B) All mineral cannot be an ore (a) All ores are minerals (c) An ore cannot be mineral The substance which is added to ore in order to remove impurities during smelting is called (b) Flux (a) slag (c) Gangue (d) Catalyst The most abundant element on earth is (b) Oxygen (a) Hydrogen (c) Silicon (d) Carbon Heating pyrites in air to remove sulphur is called (b) Fluxing (a) Calcinations (c) Smelting (d) Roasting A naturally occurring substance from which a metal can be extracted economically and Conveniently is called (b) Ore (a) Mineral (c) Gangue (d) Flux Gravity separation process may be used for the concentration of (a) Bauxite (b) Chalcopyrite (c) Calamine (d) Hematite Froth floatation process is used for the concentration of (b) Oxide ores (a) Sulphide ores (c) Chloride ores (d) Amalgams The process by which lighter earthy particles are freed from the heavier particles by washing with water is called (b) Levigation (a) Benefication (c) Leaching (d) None of these Van Arkel method of purification of metals involves converting the metal to (b) Volatile unstable compound (a) Volatile stable compound (c) Non-volatile stable compound /39/ 27.
A comprehensive text book of applied chemistry by Chander, Jagdish; Kumar, Anil