CIE Mar 2016 v2 Paper 4 Q6

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Two elements, V and W, are in adjacent groups in the Periodic Table. 12 PMT V reacts with oxygen to form an acidic gas, X. V forms an anion with formula VOm . W reacts with oxygen to form an acidic gas, Y. W forms an anion with formula WOn 2. A solution of WOn Mg2+(aq). 2 forms a white precipitate with Ba2+(aq) but shows no visible reaction with (a) Complete the table below. identity or value V X m W Y n [3] (b) By referring to enthalpy changes, explain why WOn shows no visible reaction with Mg2+. 2 forms a white precipitate with Ba2+(aq) but[3] [Total: 6]UCLES 2016 9701/42/F/M/16<br /> 13 PMT Question 7 starts on the next page.UCLES 2016 9701/42/F/M/16 [Turn over<br />

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