In qualitative analysis when 
is passed through an aqueous solution of salt acidified with
dil. HCl, 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:
Text Solution
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In qualitative analysis, when 
is passed through an aqueous solution of salt acidified with
dil. HCl , a black ppt. of CuS is obtained.
On boiling CuS with dil. 
, it forms a blue coloured solution.
(Blue solution)
Addition of excess of aqueous solution of ammonia to this solution gives deep blue solution of 
(deep blue solution)
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