Discuss corrosion concerning copper and silver vessels.

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Solution

Copper loses its luster due to the formation of a greenish layer of copper carbonate ( $C u C O_{3}$ )on its surface. This is due to the reaction of carbon dioxide and moisture in air with the surface of copper vessels.
Whereas, on exposure to air, silver articles turn blackish after some time due to the formation of a layer of silver sulphide
( $A g_{2} S$ ) formed by the reaction of silver with hydrogen sulphide in the air.

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Similar questions

Answer the following questions.

(a) Why is it possible to draw silver into a wire when even a long pencil-point breaks so easily?

(b) Why is copper used for electrical wiring in our houses?

(d) Give two characteristics of alloys.

(e) What is meant by corrosion?

Give reason

1. Aluminum is more reactive than iron yet there is less corrosion of aluminum as compared to iron when both are exposed to air.

2. Tarnished copper vessels are cleaned with tamrind juice.

Corrosion of silver is a chemical change ?

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