A suspension containing insoluble substances `ZnS, MnS, HgS, Ag_(2)S` and `FeS`, is treated with `
Channel: Doubtnut
Date: 2020-04-19

A suspension containing insoluble substances `ZnS, MnS, HgS, Ag_(2)S` and `FeS`, is treated with `2N HCl`.On filtering, the filtrate contains appreciable amounts of which one of the following ?