on reduction yields either a
colourless solution or a brown precipitate or a green solution depending on pH
of the solution.
What different
stages of the reduction do these represent and how are they carried out?
Answer:
Oxidising behaviour of 
depends on pH of the solution.
In acidic medium (pH
< 7)
In alkaline
medium (pH > 7)
In neutral
medium (pH = 7)
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