Edexcel Jan 2017 (IAL) Paper 5 Q7

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7 When excess bromine reacts with benzene in the presence of ultraviolet radiation, the product below is formed. Br Br Br Br Br Br The type of reaction occurring is free radical addition. free radical substitution. C electrophilic addition. D electrophilic substitution. 8 Phenol, C6H5OH, has a Ka value of 1.28 (cid:117) 1010 mol dm3. What is the pH of a 0.10 mol dm3 solution of phenol? (Total for Question 7 = 1 mark) A 4.94 B 5.45 9.89 D 10.89 (Total for Question 8 = 1 mark) 9 Phenylamine, C6H5NH2, is a weak base. C6H5NH2(aq) + H2O(l) (cid:85) C6H5NH3 +(aq) + OH(aq) The equilibrium constant for this reaction is 5.0 (cid:117) 1010 mol dm3. What is the concentration of OH ions, in mol dm3, in a 0.10 mol dm3 solution of phenylamine? A 2.2 (cid:117) 105 B 7.1 (cid:117) 106 C 5.0 (cid:117) 1010 D 5.0 (cid:117) 1011 (Total for Question 9 = 1 mark) *P48373A0432* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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