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Which of the following chemical is responsible for the stains on silver?

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in Corrosion Engineering by (98.5k points)
Which of the following chemical is responsible for the stains on silver?

(a) Hydrogen peroxide

(b) Hydrogen sulfide

(c) Sulfur dioxide

(d) Sulfur trioxide

This question was addressed to me in a national level competition.

Query is from Eight Forms topic in division Eight Forms of Corrosion of Corrosion Engineering

1 Answer

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Right choice is (b) Hydrogen sulfide

To elaborate: The stains on sliver is usually due to the presence of hydrogen sulfide. It can be removed by the application of galvanic corrosion. It can be done with silver-aluminum galvanic attachment in the presence of baking soda.

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