The Question : Answer the following questions: a. [Ni(H2O)6 ] 2+ (aq) is green in colour whereas [Ni(H2O)4 (en)]2+(aq)is blue in colour, give reason in support of your answer. b. Write the formula and hybridization of the following compound: tris(ethane-1,2–diamine) cobalt(III) sulphate
Solution for the question :
(a) The colour of coordination compound depends upon the type of ligand and dd transition taking place. H2O is weak field ligand, which causes small splitting, leading to the d-d transition corresponding green colour, however, due to the presence of ( en ) which ia strong field ligand, the splitting is increased. Due to the change in t2g -eg splitting the colouration of the compound changes from green to blue. (b) Formula of the compound is [Co(H2NCH2CH2NH2 )3 ]2 (SO4)3 The hybridisation of the compound is: d2sp3
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