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In qualitative analysis when $H_{2} S$ is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. ${HNO}_{3}$ , it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives _____________

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deep blue solution of $C u {(N O_{3})}_{2}$

deep blue precipitate of $C u {(O H)}_{2}$

deep blue solution of $C u {(O H)}_{2}, C u {(N O_{3})}_{2}$

deep blue solution of ${[C u {(N H_{3})}_{4}]}^{2 +}$

answer is B.

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$N H_{3} d e e p b l u e s o l u t i o n$

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