AQA Jan 2010 Paper 5 Q7

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this question is about some reactions of cobalt compounds areas outside the box will not be scanned for marking na co aq cocl aq pink solution concentrated nh aq concentrated hcl aq h o aq pale brown solution dark brown solution excess h nch ch nh a give the formula of the complex responsible for the pink colour in aqueous cocl and name its shape formula name of shape marks b give the formula of the cobalt containing compound v and describe its appearance formula appearance marks c write an equation for the reaction that occurs when the pink solution is converted into w marks wmp jan chem d give the formula of the cobalt containing complex in x and state the role of the h o in this reaction areas outside the box will not be scanned for marking formula role of h o marks e give the formula of the cobalt containing complex in y and explain why this complex is more stable than the cobalt containing complex in w formula explanation marks f identify the cobalt containing complex in solution z and explain why its co ordination number is different from that in the pink solution of cocl complex explanation marks turn over for the next question turn over wmp jan chem

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