AQA Jan 2010 Paper 2 Q10

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a when chlorine gas dissolves in cold water a pale green solution is formed in this solution the following equilibrium is established areas outside the box will not be scanned for marking cl g h o l h aq cl aq hclo aq give the formula of the species responsible for the pale green colour in the solution of chlorine in water use le chatelier s principle to explain why the green colour disappears when sodium hydroxide solution is added to this solution marks extra space wmp jan chem b consider the following reaction in which iodide ions behave as reducing agents areas outside the box will not be scanned for marking cl aq i aq i aq cl aq in terms of electrons state the meaning of the term reducing agent deduce the half equation for the conversion of chlorine into chloride ions explain why iodide ions are stronger reducing agents than chloride ions marks extra space question continues on the next page turn over wmp jan chem areas outside the box will not be scanned for marking c when chlorine reacts with water in bright sunlight only two products are formed one of these products is a colourless odourless gas and the other is an acidic solution that reacts with silver nitrate solution to give a white precipitate write an equation for the reaction of chlorine with water in bright sunlight name the white precipitate and state what you would observe when an excess of aqueous ammonia is added to it marks extra space wmp jan chem areas outside the box will not be scanned for marking d the reaction of chlorine with ethene is similar to that of bromine with ethene name and outline a mechanism for the reaction of chlorine with ethene to form dichloroethane as shown by the following equation h c ch cl clch ch cl marks end of questions wmp jan chem

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