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In the following "colourless"//"white" s...

In the following `"colourless"//"white"` sulphides `"is"//"are"`
CdS, PbS, HgS, CuS, FeS, ZnS, NiS, `Bi_(2)S_(3)`

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In the following colourless/white sulphides `"is"//"are"`
CdS, PbS, HgS, CuS, FeS, ZnS, NiS, `Bi_(2)S_(3)`
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