Edexcel Jan 2017 (IAL) Paper 4 Q11

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8 Silver oxide decomposes on heating. What is the expression for the equilibrium constant, Kp, for this reaction? Ag2O(s) (cid:111) 2Ag(s) + O2(g) 2p p ( Ag) ( O ) 2 p ( Ag O) p ( Ag O) 22 p p ( Ag) ( O ) 2 p=( O ) 2 1p ( O ) 2 (Total for Question 8 = 1 mark) 9 The dissociation of methanoic acid in aqueous solution is endothermic. When a sample of aqueous methanoic acid is warmed the pH will decrease. the pH does not change. the concentration of undissociated HCOOH will increase. D the concentration of methanoate ions will decrease. (Total for Question 9 = 1 mark) 10 Which solution has the highest pH? A 0.010 mol dm 3 sodium hydroxide solution B 0.100 mol dm 3 sodium hydroxide solution C 0.010 mol dm 3 aqueous ammonia D 0.100 mol dm 3 aqueous ammonia (Total for Question 10 = 1 mark) 11 An indicator with a pH range 3.8 to 5.4 is suitable for the titration of A nitric acid with ammonia. B ethanoic acid with sodium hydroxide. C ethanoic acid with ammonia. D sodium thiosulfate with iodine. 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 *P48372RA0528* Turn over (Total for Question 11 = 1 mark)<br />

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