Edexcel Jan 2012 Paper 3 Q1

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Answer ALL the questions. Write your answers in the spaces provided. 1 A series of tests was carried out on A, a white powder, which is known to contain one cation and one anion. Complete the table below. You may use names or formulae in your answers. Test Observations Inferences Cation is potassium (a) Carry out a flame test on A. (b) Add a mixture of dilute nitric acid and aqueous silver nitrate to an aqueous solution of A. Then add an excess of dilute aqueous ammonia to the mixture. (c) Add an aqueous solution of bromine to an aqueous solution of A.A yellow precipitate forms. Anion isWhen excess dilute aqueous ammonia is addedThe colour of the solution of bromine isWhen bromine is added to an aqueous solution of A the colour of the mixture isThe change in colour is due to the formation ofPMT (1) (2) (3) *P39305A0216*<br /> Test Observations (d) Add concentrated sulfuric acid to a solid sample of A. A vigorous reaction occurs producing a black solid, a yellow solid, a gas with an unpleasant smell and some coloured fumes. PMT Inferences The black solid isand the yellow solid is(2) (Total for Question 1 = 8 marks) *P39305A0316* Turn over<br />

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