Edexcel Jan 2017 (IAL) Paper 5 Q22

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22 The elements from scandium to zinc belong to the d-block. Most of these elements are transition elements. (a) (i) Complete the electronic configurations of a scandium atom, a manganese(III) ion and an iron(II) ion. 3d (2) 4s Sc [Ar] Mn3+ [Ar] Fe2+ [Ar] (ii) Scandium, iron and manganese are d-block elements, but only iron and manganese are transition elements. Explain the meaning of these terms. (2) d-block elementstransition elements14 *P48373A01432* 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 /> (iii) Explain, in terms of electronic configurations, why Fe2+ ions are readily oxidised to Fe3+ ions but Mn2+ ions are not readily oxidised to Mn3+ ions. (2)A E R A S I H T N I E T I R W T O N O D(iv) Explain why the Fe2+ and Fe3+ ions have different colours in aqueous solution. A detailed explanation of why transition metal ions are coloured is not required. (2) 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(b) The concentration of a solution of potassium manganate(VII), KMnO4, can be found by titration with arsenic(III) oxide, As2O3. In this reaction, arsenic(III) oxide is oxidised to arsenic(V) oxide, As2O5, and the mole ratio of As2O3 to MnO4is 5:4. Deduce the final oxidation number of the manganese. Explain your reasoning. (3)*P48373A01532* 15 Turn over<br /> (c) Oxaliplatin is a drug used for the treatment of cancer. It consists of a platinum ion linked to two different bidentate ligands. The complex can be represented by the structure shown. NH2 Pt NH2 (i) State the meaning of the term bidentate ligand. (1)(ii) Draw the structures of the two bidentate ligands in oxaliplatin. (iii) State the oxidation number of platinum in this complex. (2) (1)(Total for Question 22 = 15 marks) 16 *P48373A01632* 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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