CIE Nov 2017 v2 Paper 4 Q6

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PMT (a) Define the term transition metal complex. 13[1] (b) Platinum can form the compound [Pt(NH3)4Cl 2][PtCl 4]. State the co-ordination numbers and the oxidation numbers of the platinum in the two ions of this compound. co-ordination number oxidation number [Pt(NH3)4Cl 2]2+ [PtCl 4]2 (c) Draw three-dimensional diagrams to show the structures of the two isomers of [Pt(NH3)4Cl 2]2+. [2] [2] (d) Solutions of the compounds [Pt(NH3)4Cl 2]Br2 and [Pt(NH3)4Br2]Cl 2 can be distinguished from each other by a simple chemical test. Assume that any species bonded to the platinum ion does not react in this test. Complete the table with a test that could be used to positively identify each compound. Give details of expected observations with each compound. test observation with [Pt(NH3)4Cl 2]Br2 observation with [Pt(NH3)4Br2]Cl 2UCLES 2017 9701/42/O/N/17 [2] [Turn over<br /> PMT 14 (e) In this question you should consider geometrical and optical isomerism. What type of isomerism is shown by the following complexes? You should answer geometrical, optical, both or neither. octahedral [Co(NH2CH2CH2NH2)2Cl 2]+square planar [Ni(CN)2Cl 2]2tetrahedral [CuBr2Cl 2]2[3] (f) Many enzymes contain transition metal complexes. Describe, with the aid of a suitably labelled diagram, how an enzyme catalyses the breakdown of a substrate molecule.[3] [Total: 13]UCLES 2017 9701/42/O/N/17<br />

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