Why do metal object lose their lustre after a while?
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METALS WHEN EXPOSED TO AIR AND MOISTURE LOSE THEIR LUSTRE DUE TO THE FORMATION OF COMPOUNDS .FOR EXAMPLE:WHEN COPPER ISEXPOSED TO SUCH ENVIRONMENTAL CONDITION , IT slowly acquires a dull green coating.
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Explanation:
Metals lost their lustre after a while because it react with air and moisture.Metals like iron,aluminium etc. reacts with moist air and get oxidised and lost their shine.
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