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Pbs, CuS, As2S3, CdS are soluble in 50% HNO3 HgS, Sb2S3 are insoluble in 50% HNO3 So answer is 4 _____.

1. soluble sulfides
2. insoluble sulfides
3. amphoteric sulfides
4. basic sulfides

Correct answer: amphoteric sulfides

Solution

Amphoteric sulfides can react with both acids and bases, which allows them to dissolve in 50% HNO3, unlike insoluble sulfides that do not react with acids.

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