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
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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1 Answer
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This is a multiple choice answer as classified in NCERT Exemplar
Correct option (ii)
When H2S is passed through an aqueous solution of salt acidified with dil. HCl in qualitative analysis, a black precipitate is produced. When the precipitate is boiled with dil. HNO3, a blue solution results. When an excess of ammonia aqueous solution is added to this solution, it produces a deep blue [Cu (NH3)4]2+ solution.
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