Question:
Tarnishing of silver is due to formation of
Tarnishing of silver is due to formation of
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Silver tarnishes because of formation of black silver sulphide \((Ag_2S)\) on its surface.
Updated On: May 7, 2026
- Its sulphate layer
- Its nitrate layer
- Its sulphide layer
- Its chloride layer
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The Correct Option is C
Solution and Explanation
Silver articles slowly become black when exposed to air.
This black coating is called tarnish.
Air may contain small amounts of hydrogen sulphide:
\[
H_2S.
\]
Silver reacts with hydrogen sulphide to form silver sulphide:
\[
Ag_2S.
\]
The reaction may be written as:
\[
2Ag+H_2S\rightarrow Ag_2S+H_2.
\]
The compound:
\[
Ag_2S
\]
is black in colour.
Therefore, tarnishing of silver is due to the formation of its sulphide layer.
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