Three separate samples of a solution of a single salt gave these results. One formed a white pre...

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Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. \( \mathrm{NaCl} \) solution and one formed a black precipitate with \( \mathrm{H}_{2} \mathrm{~S} \). The salt could be -
(A) \( \mathrm{AgNO}_{3} \)
(B) \( \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \)
(C) \( \mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2} \)
(D) \( \mathrm{MnSO}_{4} \)
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