Edexcel Jan 2015 (IAL) Paper 5 Q23

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23 Compound P is a very dark purple solid which gives a lilac flame in a flame test. A sample of P was dissolved in dilute sulfuric acid to form a purple solution. A gaseous hydrocarbon, M, was bubbled into this solution which rapidly formed a colourless solution, containing an organic compound, N, and an inorganic compound, Q. When aqueous sodium hydroxide was added to Q, a very pale brown precipitate, R, formed. R darkened on standing in air to form a dark brown solid, S, which was filtered off and heated to form a dark brown metal oxide, TO2. The reaction sequence is summarised below. Solid P H2SO4 Solution of P Solution of N and Q NaOH TO2 heat Solid S air Solid R (a) Analysis of TO2 showed that it contained 36.82% by mass of oxygen. Calculate the molar mass of the metal, T, and hence identify T. You must show your working. (3) 20 *P45045A02028*<br /> (b) The mass spectrum of the organic product N, formed when M is reacted with the solution of P, is shown below. Relative intensity 100 80 60 40 20 0.0 0.0 15 30 40 50 60 70 80 90 m / e (i) Label the molecular ion on the mass spectrum and deduce the molar mass of N. (1)(ii) Identify, by name or formula, M and N. (2) *P45045A02128* 21 Turn over<br /> (c) (i) Write an ionic equation for the formation of the very pale brown precipitate, R. Include state symbols in your answer. (2) (2) (2) (ii) Suggest an equation for the conversion of the dark brown solid, S, to TO2. State symbols are not required. (d) Write the formula of the cation in P and hence give the formula of compound P.(Total for Question 23 = 12 marks) TOTAL FOR SECTION B = 51 MARKS 22 *P45045A02228*<br />

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