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Find total number of metal cations which...

Find total number of metal cations which are ppted as metal sulphide on passing `H_(2)S` gas through metal salt solution.
`Pb^(2+)(aq.)," "Mn^(2+)(aq.)," "Sn^(2+)(aq.)," "Cr^(3+)(aq.)," "Mg^(2+)(aq.)," "Hg^(2+)(aq.)," "Cu^(2+)(aq.)," "Ag^(+)(aq.)," "Al^(3+)(aq.)," "Ni^(2+)(aq.)`

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