Question

Name the type of reaction silver items turning black when left exposed to air

Answer 1

Silver article turns black when kept in the air because silver article reacts with sulphur compounds such as hydrogen sulphide (H2S) present in air. The phenomenon is called corrosion. For silver particularly, it is called tarnishing of silver. The black substance formed is silver sulphide

Answer 2

Single replacement is the type of reaction for silver items turning black when left exposed to air

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A general single displacement reaction can be represented as :

$X+YZ\rightarrow XZ+Y$

Reaction of silver with hydrogen sulphide gives silver sulphide which is black in color and thus leads to corrosion of silver.

$2Ag+H_2S\rightarrow Ag_2S+H_2$

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