Consider the sulphides , , , , and CdS. Number of these sulphides soluble in is .

Question

Consider the sulphides , , , ,  and CdS. Number of these sulphides soluble in  is .

Canvas Classes · Accepted Answer

Solubility of sulphides in 50% :

(50%) is a moderately strong oxidising acid.

| Sulphide | Soluble in 50% HNO₃? |
|---|---|
| HgS | No — HgS is extremely insoluble (very low ), requires aqua regia |
| PbS | Yes ✓ |
| CuS | Yes ✓ |
|  | Yes ✓ |
|  | Yes ✓ |
| CdS | No — CdS is relatively insoluble in dilute/moderate HNO₃ |

Soluble: PbS, CuS, ,  = 4

Answer: 4

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