(b) What kind of electronic transitions are responsible for the colours of the following species? For each case, state t

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B What Kind Of Electronic Transitions Are Responsible For The Colours Of The Following Species For Each Case State T 1 (248.66 KiB) Viewed 63 times

(b) What kind of electronic transitions are responsible for the colours of the following species? For each case, state the type of the electronic transition, the orbitals between which the transition occurs and briefly explain the reason for your assignment. (i) Ruby (contains Cr3+ in Al2O3), red. [2 marks] (ii) Sapphire (contains Fe2+ and Ti4+ in Al2O3), intense blue. [2 marks] (iii) Cr20-2-, deep orange. [2 marks] (iv) [W04]?-, colourless but shows a very strong band in the UV. [2 marks] (v) [Fe(bpy)3]2+, deep red. [2 marks] (d) Consider the reaction: [Co(NH3)s(H20)]3+ +X- → [Co(NH3)$X]2+ + H20 (i) Is this an electron transfer or a substitution reaction? Justify your answer. [2 marks] (ii) The reaction rate changes by less than a factor of 2 when X-is varied among C1, Br, N3 , and SCN . What does this observation say about the reaction mechanism? [4 marks]