AQA Jan 2013 Paper 5 Q8

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do not write outside the box a explain the meaning of the terms ligand and bidentate as applied to transition metal complexes marks b aqueous cobalt ii ions react separately with an excess of chloride ions and with an excess of ammonia for each reaction draw a diagram to illustrate the structure of the shape of and the charge on the complex ion formed in each case name the shape and indicate on the diagram a value for the ligand metal ligand bond angle marks wmp jan chem do not write outside the box c the complex ion formed in aqueous solution between cobalt ii ions and chloride ions is a different colour from the co h o ion explain why these complex ions have different colours marks d in aqueous ammonia cobalt ii ions are oxidised to cobalt iii ions by hydrogen peroxide the h o is reduced to hydroxide ions calculate the minimum volume of mol dm h o solution required to oxidise the co ions in g of coso h o marks end of questions wmp jan chem

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