Question

Why does silver gets tarnished on exposure to air

Answer 1

Answer:

In physiology, a stimulus[1] is a detectable change in the physical or chemical structure of an organism's internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity.

Answer 2

Answer:

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Background. When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish. ... If a silver object is to be kept from tarnishing, it must be protected from sulfur-containing gases.