CIE Nov 2016 v2 Paper 4 Q1

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Answer all the questions in the spaces provided. Transition elements are important metals because of their characteristic properties. PMT (a) De ne what is meant by a transition element.[1] (b) (i) For each of the following complexes, state the co-ordination number and the oxidation number of the transition element present. co-ordination number oxidation number [Ni(CN)2(NH3)2] [CrCl 2(H2O)4]+ (ii) State the type of bonding that exists between the ligand and the metal ion in these complexes.[1] (iii) Suggest the structure of [Ni(CN)2(NH3)2] and name its shape. [2] name of shape[2] (c) The complex ion [Cr(H2O)6]3+ can be converted into [CrCl 2(H2O)4]+. (i) Suggest a suitable reagent for this conversion.[1] (ii) State the type of reaction in (i).[1]UCLES 2016 9701/42/O/N/16<br /> PMT (d) The [CrCl 2(H2O)4]+ complex ion shows stereoisomerism. (i) Name this type of stereoisomerism.[1] (ii) Draw three-dimensional diagrams to show the two stereoisomers of [CrCl 2(H2O)4]+. [3] [Total: 12]UCLES 2016 9701/42/O/N/16 [Turn over<br />

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