A white solid forms Rinmann's greenn in ...

A white solid forms Rinmann's greenn in the charcoal cavity test in an oxidising flame. On treatment with dilute `H_(2)SO_(4)`, this solid produces a gas that turns an acidified dichromate paper green ad lead acetate paper black. The white solid is:

`PbS`

`ZnSO_(3)`

`ZnS`

`Na_(2)S`

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