is white while hydrated is blue in colour.
(ii) 
is violet in colour but becomes colourless
on heating.
Answer:
Ethane-1,2 diamine is stronger
ligand than 
. When FLO molecule is replaced by
ethane-1,2-diamine (en) the crystal field splitting energy 
increases. Complex absorbs light of
higher frequency for d-d transition. This is why colour of complex
changes from green to violet.
Green,
violet
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