in
acidic medium.
(ii) Acidification of potassium dichromate solution.
(iii) Disproportionate of manganese ion in acidic
solution. [3x1]
Answer:
(i)
[1]
is
oxidised to 
and 
is
reduced to 
(ii) In acidic medium 
is
reduced to 
(green)
and is thus an oxidising agent.
(iii)
Thus,
(manganate)
ion disproportionates to and
in
acidic medium.
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