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In the following the number metal sulphi...

In the following the number metal sulphides are not dissolve in yellow ammonium polysulphide. `Hg^(+2), Pb^(+2), Bi^(+3), Cu^(+2), As^(+3), Sn^(+2) Sb^(+5)`

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The correct Answer is:
3
IIA group = HgS, PbS, `B_(12)S_(3)`, CuS
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