Question

shining surface of metal is tarnished after some time. Give reason

Answer 1

because of oxidation that takes place on the surface of the meta which leads to rusting

Answer 2

Answer:

The surface of metals undergo oxidation under the influence of air, moisture and chemicals such as acids, which is called corrosion. Because of this process, the shining surface of metals is tarnished after some time. For example, iron turns reddish brown due to corrosion and silver turns greyish due to this process