Answer:
(i)
When is
oxidised there is no effect on the stability. Thus is a
reducing agent.
When is
reduced to stability
increases. Thus is
an oxidising agent. [1]
(ii) We can
consider the case of Sc (21)
is
unstable and is easily oxidised to to
attain stable configuration of the inert gas Thus, 3d1
configuration is very unstable in ion.
[1]
(iii)
Thus is
oxidised to when
complexing takes place.
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