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By Chander, Jagdish; Kumar, Anil

ISBN-10: 128280099X

ISBN-13: 9781282800991

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Uses - The principal use of wood is as domestic fuel, the soft resinous varieties like fir, spruce and pine being the most desirable. 2. COAL - Coal is by far the most important solids fuel and is formed by the action of decay, heat and pressure upon vegetables and woody materials deposited many years ago. Coal varies to a great extent in composition and properties, the most important types are peat, lignite, bituminous and anthracite coal. These are discussed belowi) Peat - Peat is the first stage of transformation of wood into coal.

Let V2 mt. lN NaOH was required to neutralize excess and Thus, the amount of acid neutralized by liberated NH3 is determined. l(Vl - V2 ) 1000 = = Wt. of N = . l(Vl - V2 ) x 14 1000 Wt. ofN ----------------------xl00 Wt. 4 Importance - As nitrogen is an inert and incombustible gas, therefore its presence is undesirable. Thus a good quality coal should have very little nitrogen content. iii) Determination of Sulphur - A known weight of coal is burnt completely in Bomb Calorimeter in a current of oxygen.

20. 21. 22. 23. 24. 25. 26. The process in which the ora is heated in excess of air below its melting point is called (b) Distillation (a) Roasting (c) Calcinations (d) Reduction In the floation Process for the purification of minerals the particles floal because (b) They are insoluble (a) they are light (c) They bear an electrostatic charge (d) Their surface is preferentially wetted by oil Which of the following statement is correct. (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.

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