Question

why do iron objects develop a reddish brown layer on their surface on exposure to moist air

Answer 1

as they react with oxygen to form Fe2O4.xh2o which is called as rust

Answer 2

~*HEY FRIEND*~
~* THE ANSWER OF YOUR QUESTION IS..*~

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THE REDDISH BROWN LAYER DEVELOPES ON IRON SURFACE DUE TO THE REACTION OF IRON WITH OXYGEN PRESENT IN MOISTURE OR IN AIR AND SO THE REDDISH BROWN COATING IS OF FERROUS OXIDE..