Select the correct statement(s) about the chemical behavior of metallic sulphides encountered in qua — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Group IV sulphides $ZnS$ and $MnS$ dissolve in conc. $HCl$. $NiS$ and $CoS$ require an oxidizing agent or aqua regia to dissolve. Group II sulphide $CuS$ dissolves in $50\%$ $HNO_3$, but $HgS$ is unique as it does not dissolve in $50\%$ $HNO_3$ and requires aqua regia.