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In qualitative analysis when \( \mathrm{H}_{2} \mathrm{~S} \) is passed through an aqueous solution of salt acidified with dil. \( \mathrm{HCl} \), a black precipitate is obtained. On boiling the precipitate with dil. \( \mathrm{HNO}_{3} \), it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives
(i) deep blue precipitate of \( \mathrm{Cu}(\mathrm{OH})_{2} \)
(ii) deep blue solution of \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \)
(iii) deep blue solution of \( \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2} \)
(iv) deep blue solution of \( \mathrm{Cu}(\mathrm{OH})_{2} \cdot \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2} \)
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