Question 38
MediumOriginal questionSilver jewellery and utensils turn black after some time in air. The black coating is
Show the answer and explanation
CorrectNot quiteAnswer C
Correct answer: C
Explanation
Silver reacts with traces of sulphur compounds, such as hydrogen sulphide, in the air.
The product is black silver sulphide. This tarnishing is a kind of corrosion.
- Concept
- Tarnishing of silver
- Typical timeTypical
- 60 s
- Your timeYours
- —
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