AQA Jun 2010 Paper 1 Q4

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do not write outside the box a there are several oxides of nitrogen an oxide of nitrogen contains by mass of nitrogen determine the empirical formula of this oxide marks extra space b give one reason why the oxide no is a pollutant gas mark c the oxide no reacts with oxygen to form nitrogen dioxide write an equation for this reaction mark d explain how no is produced in the engine of a motor vehicle marks e write an equation to show how no is removed from the exhaust gases in motor vehicles using a catalytic converter mark wmp jun chem do not write outside the box the alkane butane is used as a fuel a i write an equation for the complete combustion of butane mark a ii state a condition which may cause carbon to be formed as a product in the combustion of butane mark b butane obtained from crude oil may contain trace amounts of an impurity when this impurity burns it produces a toxic gas that can be removed by reacting it with calcium oxide coated on a mesh b i suggest the identity of the toxic gas mark b ii suggest why calcium oxide reacts with the toxic gas mark b iii suggest why the calcium oxide is coated on a mesh mark turn over for the next question turn over wmp jun chem

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