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Find out the number of cation (s) which form(s) black ppt. (soluble in hot and dilute `HNO_(3)`) on passing `H_(2)S` gas into their salt solution?
`Mg^(2+)(aq.)Cu^(2+)(aq.),Ba^(2+)(aq.),Fe^(3+)(aq.),Ag^(+)(aq.),Al^(3+)(aq.),Hg^(2+)(aq.),Pb^(2+)(aq.),Mn^(2+)(aq.)`

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