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Edexcel Jun 2017 Paper 4 Q10
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![Question Number 8 Question Number 9 Question Number 10(a) Question Number 10(b) Answer 8. The only correct answer is A B is not correct because this is the pH at 298 K C is not correct because this is incorrect as there are more H+ ions at higher temperature so pH is lower than 7 D is not correct because this is pKw Answer 9. The only correct answer is B A is not correct because this is pH of 1.0 mol dm-3 solution C is not correct because this is pKa D is not correct because this is the answer when square root is not taken to calculate [H+] Answer 10(a). The only correct answer is B A is not correct because this is the pH of the weak acid C is not correct because this is the neutral pH D is not correct because this is the pH with excess NaOH Answer 10(b). The only correct answer is B A is not correct because this assumes a 1:2 mole ratio C is not correct because this has not used 20 cm3 from the graph and assumed equal volumes D is not correct because this has mixed up the two volumes Mark (1) Mark (1) Mark (1) Mark (1)<br />
Mark (1) Mark (1) Mark (1) Mark (1) Question Number 10(c) Question Number 10(d) Question Number 11 Answer 10(c). The only correct answer is D A is not correct because changes at too low pH range B is not correct because changes at too low pH range C is not correct because not the best as complete range of pH change is not in the vertical region of the graph Answer 10(d). The only correct answer is B A is not correct because this is too low, the best buffer solution is formed when the weak acid is half-neutralised C is not correct because this is the volume to reach the end point D is not correct because this is when there is excess alkali present Answer 11. The only correct answer is D A is not correct because low boiling point as no hydrogen bonding B is not correct because - low boiling point as no hydrogen bonding C is not correct because higher boiling point than A or B as hydrogen bonding but fewer hydrogen bonds than D Question Number Answer 12. The only correct answer is A B is not correct because does not have CH3CO in structure C is not correct because does not have CH3CO in structure D is not correct because does not have CH3CO in structure 12<br />](https://learnah.org/wp-content/uploads/2018/08/June_2017_MS_-_Unit_4_Edexcel_Chemistry_A-level_10-0-1.jpg)
