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(A) When $H_2S$ gas is passed through a solution containing metal ions,it forms metal sulfides. $AgNO_3$ reacts with $H_2S$ to form $Ag_2S$,which is a

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Acidic $AgNO_3$

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(A) When $H_2S$ gas is passed through a solution containing metal ions,it forms metal sulfides. $AgNO_3$ reacts with $H_2S$ to form $Ag_2S$,which is a black precipitate. $2Ag^+ + H_2S \rightarrow Ag_2S(s) + 2H^+$. Copper nitrate $(Cu(NO_3)_2)$ also forms a black precipitate of $CuS$ $(Cu^{2+} + H_2S \rightarrow CuS(s) + 2H^+)$. However,in standard qualitative analysis,$Ag_2S$ is a classic example of a black precipitate formed in acidic media. Both $A$ and $D$ are technically correct,but $AgNO_3$ is the most common textbook example for this reaction.

Which of the following solutions will yield a black precipitate when $H_2S$ gas is passed through it?

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