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How many metal cations get precipitated,...

How many metal cations get precipitated, when `(NH_(4))_(2)S` solution is added into the aqueous solutions of the following cations?
`Ag^(+),Cu^(2+),Cr^(3+),Mn^(2+),Zn^(2+),Bi^(3+)`

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The correct Answer is:
6
`Ag^(+),Cu^(2+),Zn^(2+),Bi^(3+),Cr^(3+),Mn^(2+)`
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