AQA Jan 2013 Paper 2 Q3

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do not write outside the box a this question is about the extraction of metals manganese can be extracted from mn o by reduction with carbon monoxide at high temperature a i use the standard enthalpy of formation data from the table and the equation for the extraction of manganese to calculate a value for the standard enthalpy change of this extraction hf kj mol mn o s co g mn s co g mn o s co g mn s co g marks a ii state why the value for the standard enthalpy of formation of mn s is zero mark wmp jan chem do not write outside the box b titanium is extracted in industry from titanium iv oxide in a two stage process b i write an equation for the first stage of this extraction in which titanium iv oxide is converted into titanium iv chloride marks b ii write an equation for the second stage of this extraction in which titanium iv chloride is converted into titanium marks c chromium is extracted in industry from chromite fecr o c i in the first stage of this extraction the fecr o is converted into na cro balance the equation for this reaction fecr o na co o na cro fe o co mark c ii in the final stage chromium is extracted from cr o by reduction with aluminium write an equation for this reaction mark turn over for the next question turn over wmp jan chem

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