OCR A Jan 2013 Paper 5 Q1

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Answer all the questions. This question refers to chemistry of d-block elements in Period 4 (ScZn). (a) For each statement below, select the symbols of the correct element(s). (i) The element that has atoms containing six electrons in the 3d sub-shell.[1] (ii) Two elements that have atoms with two unpaired d electrons.and[2] (iii) The element with ions that form a blue complex with chloride ions. (iv) The element X that forms an oxide with the formula X3O4 with the molar mass of 228.7 g mol1.[1][1] (v) The element that has atoms with an average mass of 8.641023 g.[1] (b) The flowchart below shows three reactions of the complex ion [Cu(H2O)6]2+. In the boxes below, write down the formulae of the species formed. [Cu(H2O)6]2+ pale blue solution NH3(aq) HCl (aq) NaOH(aq) deep blue solution yellow solution pale blue precipitate [3]OCR 2013<br />
 (c) The answers to this question all refer to complex ions of nickel. (i) State the shape of the complex ion [Ni(H2O)6]2+.[1] (ii) What is the formula of the complex ion of Ni2+ containing six fluoride ligands?[1] (iii) Show the 3-D shapes of the stereoisomers of the complex ion [Ni(en)3]2+. (en = H2NCH2CH2NH2) [2] [Total: 13]OCR 2013 Turn over<br />

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