Question

when an iron article is kept in open atmosphere it gets covered with a powdery substance . why?

Answer 1

here's your answer
it is so because it comes in contact with air and moisture due to which rust gets covered on iron articles
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Answer 2

HEY MATE HERE IS YOUR ANS :)

THAT POWDERY SUBSTANCE IS RUST
AND IT HAPPEN'S BECAUSE WHEN WE KEPT IRON ARTICLES OPEN IN ATMOSPHERE IT REACT WITH MOISTURE PRESENT IN AIR OR ATMOSPHERE AND FORM IRON OXIDE WHICH IS KNOWN AS RUST.


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