Question:
Which of these sulfides is not black?
Which of these sulfides is not black?
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Cadmium sulfide (CdS) is yellow in color and is commonly used as a pigment. All other metal sulfides listed (CuS, PbS, Ag\(_2\)S) are black in color.
Updated On: Jan 13, 2026
- CuS
- PbS
- Ag\(_2\)S
- CdS
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The Correct Option is D
Solution and Explanation
The color of metal sulfides depends on the metal ion and the nature of the compound.
Most transition metal sulfides are black due to their ability to absorb a wide range of wavelengths.
Let's review the color of each sulfide:
CuS (Copper sulfide): Black in color.
PbS (Lead sulfide): Black in color, often formed in qualitative analysis.
Ag\(_2\)S (Silver sulfide): Black precipitate, tarnishes silver items.
CdS (Cadmium sulfide): Yellow in color, not black. It is often used as a yellow pigment (cadmium yellow).
Hence, among the options, only Cadmium sulfide (CdS) is not black.
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