AQA Jun 2016 Paper 2 Q6

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do not write outside the box the halogens are the elements in group a the electronegativities of the halogens are shown in table table halogen fluorine chlorine bromine iodine electronegativity explain the trend in electronegativities shown by the halogens marks b the halogens can all behave as oxidising agents in reactions b i explain in terms of electron transfer the meaning of the term oxidising agent mark b ii an equation for the reaction that takes place when chlorine gas is bubbled through aqueous potassium bromide is shown cl g kbr aq br aq kcl aq explain with reference to the oxidation states why this is a redox reaction mark wmp jun chem do not write outside the box c solid sodium halides react with concentrated sulfuric acid c i a sample of solid sodium iodide is reacted with concentrated sulfuric acid a black solid forms and hydrogen sulfide gas is produced write a half equation for the reaction of sulfuric acid to form hydrogen sulfide mark c ii write a half equation for the formation of the black solid mark c iii use your answers to parts c i and c ii to write an overall equation for the reaction of sodium iodide with concentrated sulfuric acid mark c iv give the role of sulfuric acid in its reaction with sodium iodide tick one box mark acid oxidising agent reducing agent electrophile c v write an equation for the reaction of concentrated sulfuric acid with solid sodium fluoride mark c vi suggest one reason why the reaction of sodium fluoride with concentrated sulfuric acid is different from the reaction with sodium iodide mark turn over wmp jun chem do not write outside the box d chlorine reacts with water to form an equilibrium mixture containing hydrochloric acid and chloric i acid d i write an equation for the formation of this equilibrium mixture mark d ii household bleach contains sodium chlorate i and sodium chloride state and explain with reference to your equation in part d i why it is dangerous to acidify an aqueous mixture of sodium chlorate i and sodium chloride marks wmp jun chem

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