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Posted: **Mon May 16, 2022 11:01 pm**

: D Consider The Reaction Co Nh3 S H20 X Co Nh3 Sx 2 H2o I Is This An Electron Transfer Or A Substitution Re 1 (16.36 KiB) Viewed 69 times

: D Consider The Reaction Co Nh3 S H20 X Co Nh3 Sx 2 H2o I Is This An Electron Transfer Or A Substitution Re 2 (25.02 KiB) Viewed 69 times

(d) Consider the reaction: [CO(NH3)s(H20)]" + x[Co(NH3)sX]2+ + H2O (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]

(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 Crt in Al Os), red. [2 marks] (ii) Sapphire (contains Fe²+ and Ti* in Al03), intense blue. [2 marks] (iii) Cr202, deep orange. [2 marks] [2 marks] (iv) [W04), colourless but shows a very strong band in the UV. (v) [Fe(bpy);]*deep red. [2 marks]