AQA Jan 2013 Paper 5 Q6

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do not write outside the box a transition metal compounds have a range of applications as catalysts state the general property of transition metals that allows the vanadium in vanadium v oxide to act as a catalyst in the contact process mark b write two equations to show how vanadium v oxide acts as a catalyst in the contact process equation equation marks c in the contact process vanadium v oxide acts as a heterogeneous catalyst c i give the meaning of the term heterogeneous mark c ii give one reason why impurities in the reactants can cause problems in processes that use heterogeneous catalysts mark wmp jan chem do not write outside the box d the oxidation of c o reaction that is autocatalysed ions by mno ions in acidic solution is an example of a d i give the meaning of the term autocatalysed mark d ii identify the autocatalyst in this reaction mark d iii write two equations to show how the autocatalyst is involved in this oxidation of c o ions equation equation marks turn over for the next question turn over wmp jan chem

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