In aluminium extraction by the Bayer process, alumina is extracted from bauxite by sodium hydroxide at high temperature and pressures : Al O (s) 2OH (aq) 2Al O (aq) H O(1) 2 - 32 + ? 22 + - Solid impurities such as Fe2 O3 and SiO2 are removed and then - A 4 l(OH) is reprecipitated : 2Al(OH) Al .O 3H O(s) 2OH (aq) - 232 - 4 ? + . In the industrial world : (A) Carbon dioxide is added to precipitate the alumina (B) Temperature and pressure are dropped and the supersaturated solution seeded (C) Both (A) and (B) are practised (D) The water is evaporated

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

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