A suspension containing insoluble substances.$\mathrm{Zns}$$\mathrm{MnS},\mathrm{HgS},{\mathrm{Ag}}_2\mathrm{S}$ and $\mathrm{FeS}$ is treated with $2\mathrm{N} \mathrm{HCI}$ On filtering the filtrate contains appreciable amounts of which one of the following?

 

$\mathrm{Zns}$ $\mathrm{Mn},$ and $\mathrm{FeS}$ are soluble in solution. Because of this, the filtrate includes zinc, manganese, and iron. While $\mathrm{HgS}$ and ${\mathrm{Ag}}_2 \mathrm{S}$ are insoluble in $2\mathrm{NHCI}$ solution. Hg and Ag are therefore absent from the filtrate.  

Hence, the option D is correct