Edexcel Jun 2017 (IAL) Paper 5 Q4

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4 Ammonium vanadate(V), NH4VO3, dissolves in aqueous sodium hydroxide solution releasing a colourless gas. The gas gives a pale blue precipitate with aqueous copper(II) sulfate. What is the colourless gas? A H B N C NH D O 2 5 25.0 cm3 of a 0.0100 mol dm3 solution of vanadium(II) ions is titrated with an acidified solution containing 0.0200 mol dm3 manganate(VII) ions, MnO4 . (Total for Question 4 = 1 mark) 3MnO4+ 5V2+ + 4H+ (cid:111) 3Mn2+ + 5VO2 + + 2H2O What volume, in cm3, of this solution of manganate(VII) ions is needed for the reaction? 7.5 B 15.0 C 20.8 D 41.7 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 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 *P48387A0332* Turn over<br />

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