Edexcel Jun 2017 Paper 5 Q5

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4 Use the data provided to deduce the species which reacts with V3+(aq) to form VO2+(aq). Electrode reaction Fe2+(aq) + 2e (cid:85) Fe(s) VO2+(aq) + 2H+(aq) + e (cid:85) V3+(aq) + H2O(l) Ag+(aq) + e (cid:85) Ag(s) Standard electrode potential/ V 0.44 +0.34 +0.80 A Fe 2+(aq) B Fe(s) C Ag +(aq) D Ag(s) (Total for Question 4 = 1 mark) In a fuel cell breathalyser, the following reaction occurs at one electrode. C2H5OH(g) + H2O(l) (cid:111) CH3COOH(aq) + 4H+(aq) + 4e The reaction occurring at the other electrode is A 4H +(aq) + O2(g) + 4e (cid:111) 2H2O(l) B 2H 2(g) + 2O2(g) + 4e (cid:111) 4OH(aq) C 4OH (aq) (cid:111) 2H2(g) + 2O2(g) + 4e D 2H 2O(l) (cid:111) 4H+(aq) + O2(g) + 4e A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D Use this space for any rough working. Anything you write in this space will gain no credit. (Total for Question 5 = 1 mark) A E R A S I H T N I E T I R W T O N O D *P48070A0328* Turn over<br />

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