Three separate samples of a solution of a single salt gave these test results: one formed a white precipitate with excess ammonia solution,one formed a white precipitate with dilute $NaCl$ solution,and one formed a black precipitate with $H_2S$. The salt could be:
- A$AgNO_3$
- B$Pb(NO_3)_2$
- C$Hg(NO_3)_2$
- D$MnSO_4$
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