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Surface of metals loses their brightness...

Surface of metals loses their brightness when kept in air for a long time. Why ?

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Metals react with oxygen and moisture in air, forming a layer of metal oxide on the surface of the metal.
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ZEN PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS-ZEN ADDITIONAL QUESTIONS SECTION (VERY - SHORT - ANSWER [VSA] TYPE QUESTIONS )
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  9. Which two gases are evolved when ferrous sulphate is heated ?

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  10. What is a redox reaction ?

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  11. Why do potato - chips manufactures fill the packest of chips with nitr...

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  12. Surface of metals loses their brightness when kept in air for a long t...

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  13. Give two wxamples from daily where redox reactions are taking place.

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  14. Which one is a chemical change - rusting or iron or melting of ice ?

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  16. Write balanced chemical equation FeSO(4)(s)overset("heat")(to)Fe(2)O...

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  18. AgNO(3)+NaCl to AgCldarr+NaNO(3) FeS+H(2)SO(4)toFeSO(4)+H(2)Suarr ...

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  19. What is neutralisation reaction?

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