is passed through an aqueous solution of salt acidified
with dil. HCI, a black precipitate is obtained. On boiling the precipitate with
dil. 
, it forms a solution of blue colour. Addition of excess of
aqueous solution of ammonia to this solution gives..........
(a) deep blue precipitate of 
(b) deep blue solution of 
(c) deep blue solution of 
(d) deep blue solution-of
Answer:
(b) In qualitative analysis when 
is
passed through an aqueous solution of salt acidified with dil. HCI a black ppt.
of 
is obtained.
On boiling with dil. 
it forms a blue coloured solution
and the following reactions occur
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