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

Open in App

Solution

Some metals, when exposed to air for a long time, react with oxygen in the atmosphere to form a dull layer of metal oxide on their surfaces. This makes the metals look dull.

Suggest Corrections

Similar questions

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

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 __________ .

Q. Why non-metals have a dull appearance?

When copper is exposed to moist air for a long time then a layer deposits on its surface due to corrosion. The colour of this layer is:

Join BYJU'S Learning Program