Question

two material which lose lustre when exposed to air and water​

Answer 1

Answer:

Copper and iron

Hope it helps you.

Answer 2

→Answers :

Metals such as gold, silver, copper and aluminium are among materials that have this quality.

→Reason ;

The metals lose their shine on brightness on keeping in air for a long time due to formation of a thin layer of oxide, carbonate or sulphide on their surface by the slow action of various gases present in air.