Sarthaks Test
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In qualitative analysis when H2S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO3, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives _________. 

(i) deep blue precipitate of Cu (OH)2 

(ii) deep blue solution of [Cu (NH3)4]2+ 

(iii) deep blue solution of Cu(NO3)2 

(iv) deep blue solution of Cu(OH)2.Cu(NO3)2

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(ii) deep blue solution of [Cu (NH3)4]2+ 

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