AQA Jun 2013 Paper 2 Q4

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do not write outside the box the price of copper is increasing as supplies of high grade ores start to run out the mineral covellite cus found in low grade ores is a possible future source of copper a when copper is extracted from covellite a reaction occurs between copper ii sulfide and nitric acid to form a dilute solution of copper ii sulfate a i balance the equation for this reaction cus s hno aq cuso aq no g h o i a ii give the oxidation state of nitrogen in each of the following hno no mark marks a iii deduce the redox half equation for the reduction of the nitrate ion in acidified solution to form nitrogen monoxide and water mark a iv deduce the redox half equation for the oxidation of the sulfide ion in aqueous solution to form the sulfate ion and h aq ions mark wmp jun chem do not write outside the box b use your knowledge of metal reactivity to state and explain a low cost method for the extraction of copper from a dilute aqueous solution of copper ii sulfate write the simplest ionic equation for the reaction that occurs during this extraction process simplest ionic equation marks turn over for the next question turn over wmp jun chem

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