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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 _________.
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 _________.
CBSE | Chemistry | Class 12 | Exercise 1 | NCERT Exemplar | The P-Block Elements
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) a deep blue precipitate of Cu (OH)2

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

(iii) a deep blue solution of Cu(NO3)2

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

 

Correct Answer: (ii) a deep blue solution of [Cu (NH3)4]2+

Explanation: 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 a deep blue solution of [Cu (NH3)4]2+

i

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