To a solution of a substance, gradual addition of ammonium hydroxide results in a brown ppt. which does not dissolve in excess o

To a solution of a substance, gradual addition of ammonium hydroxide results in a brown ppt. which does not dissolve in excess of `NH_4 OH`. However, when HCl is added to the original solution, a white ppt. is formed. The solution contained
A. Lead salt
B. silver salt
C. mercurous salt
D. copper salt

To a solution of a substance, gradual addition of ammonium hydroxide results in a brown ppt. which does not dissolve in excess of `NH_4 OH`. However,

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