Question

- Why do some metals lose their lustre when left in the open for some time? How can this lustre be restored? Please answer fast​

Answer 1

metals react with atmospheric oxygen to form metal oxide which are dull in nature

this can be restored by rubbing on metal surface by sand paper it is because sand paper Remove oxide layer of metal and metal again become lustrous

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Answer 2

Answer:

some metals lose their lustre when left in the open for some time because oxidation occurs. ... this lustre can be restored by preventing the contact of water molecules on the metal.

we can restore luster by polishing or grinding away the top most layer .

Explanation:

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