Edexcel Jun 2016 (IAL) Paper 6 Q

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Answer ALL the questions. Write your answers in the spaces provided. 1 A series of tests is carried out on aqueous solutions, X, Y and Z. Each solution contains a compound of a different d-block element. (a) Tests A and B, described in the table, are carried out on solution X. Test Observations To 1cm3 of solution X in a test tube, add dilute sodium hydroxide solution, drop by drop, until no further change occurs. Shake the test tube gently as you add the dilute sodium hydroxide solution. A white precipitate forms initially. The white precipitate dissolves in excess sodium hydroxide solution to form a colourless solution. To 1cm3 of solution X in a test tube, add dilute aqueous ammonia solution, drop by drop, until no further change occurs. Shake the test tube gently as you add the aqueous ammonia solution. A white precipitate forms initially. The white precipitate dissolves in excess aqueous ammonia solution to form a colourless solution. (i) Write the formula of the complex ion that is present at the end of Test A. (ii) Write the formula of the complex ion that is present at the end of Test B. (1) (1) *P46666A0224* 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 /> A E R A S I H T N I E T I R W T O N O D (b) Test C, described in the table, is carried out on solution Y. Test Observations To 2cm3 of solution Y in a boiling tube, add dilute sodium hydroxide solution, drop by drop, until no further change occurs. A green precipitate forms initially. The green precipitate dissolves to form a green solution. Next add 2cm3 more of dilute sodium hydroxide solution and 5cm3 of hydrogen peroxide solution. Shake the tube gently and stand it in a beaker of hot water for a few minutes. A yellow solution forms. (i) Write an ionic equation, including state symbols, for the formation of the green precipitate in Test C. A E R A S I H T N I E T I R W T O N O D (ii) Give the oxidation numbers, including signs, of the d-block element in Test C. Before the addition of hydrogen peroxideAt the end of Test C(1) (2) A E R A S I H T N I E T I R W T O N O D *P46666A0324* Turn over<br /> (c) Test D, described in the table, is carried out on solution Z. Test Observations To 2cm3 of solution Z in a test tube, add an equal volume of dilute sodium hydroxide solution. Then add 10 drops of aqueous hydrogen peroxide solution. An off-white precipitate forms initially. The off-white precipitate darkens. Give the formula of the d-block metal cation present in solution Z. (1) (Total for Question 1 = 6 marks) *P46666A0424* 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 /> 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 BLANK PAGE A E R A S I H T N I E T I R W T O N O D *P46666A0524* Turn over<br />

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