H_2S gas is passed through an acidified solut | vedclass

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(C) In an acidified solution,$H_2S$ provides a low concentration of $S^{2-}$ ions due to the common ion effect of $H^+$.$Ag^+$ and $Cu^{2+}$ belong to

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$Cu^{2+}$

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(C) In an acidified solution,$H_2S$ provides a low concentration of $S^{2-}$ ions due to the common ion effect of $H^+$.$Ag^+$ and $Cu^{2+}$ belong to Group $II$ of the qualitative analysis scheme,which precipitate as sulfides in acidic medium.$Zn^{2+}$ belongs to Group $III$ (or $IV$ depending on the scheme) and requires a basic medium to precipitate as $ZnS$.Therefore,both $Ag^+$ and $Cu^{2+}$ will form precipitates ($Ag_2S$ and $CuS$).Since the question asks which forms a precipitate and both $Ag$ and $Cu$ are options,the most accurate answer in a multiple-choice context where only one is selected is often $Cu^{2+}$ or $Ag^+$. Given the options,$Cu^{2+}$ is a classic example of Group $II$ precipitation.

$H_2S$ gas is passed through an acidified solution containing $Ag^+$,$Cu^{2+}$,and $Zn^{2+}$ ions. Which of these will form a precipitate?

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