Give reason for the following.
The shining surface of some metal become dull when exposed to air for a long time.

Open in App

Solution

When some metals get exposed to air there is an oxidation process occurring on the outer layer of the metal. Due to the oxidation; a new layer covers the existing metal; hiding its original view; giving it a dull appearance. Almost all metals combine with oxygen to form metal oxides.
Metal + Oxygen $\to$ Metal oxide.

Suggest Corrections

Similar questions

Q. Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

(a) Give the reason why copper is used to make hot water tanks but steel (an alloy of iron) is not
(b) Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time.

Q. Metals have lustre (shine). Give reason why some metal articles become dull and loose their shine.

Q. Metals have lustre (shine). Give reason why some metal articles become dull and lose their shine after sometime.

The surface of some metals, such as iron, is corroded when they are exposed to moist air for a long period of time. This phenomenon is known as __________ .

Join BYJU'S Learning Program

Give reason for the following.The shining surface of some metal become dull when exposed to air for a long time.

Give reason for the following.
The shining surface of some metal become dull when exposed to air for a long time.