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Among PbS, CuS, MnS, Ag(2)S, NiS, CoS, B...

Among `PbS, CuS, MnS, Ag_(2)S, NiS, CoS, Bi_(2)S_(3)` and `SnS_(2)` the total number of block coloured sulphides is

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Among PbS, CuS, HgS, MnS, Ag_(2)S , NiS, CoS, Bi_(2)S_(3) and SnS_(2) , total number of black coloured sulphides is :

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Consider the sulphides HgS, PbS, CuS, Sb_(2)S_(3), As_(2)S_(3) and CdS. Number of these sulphides soluble in 50% HNO_(3) is__________