Question

explain how painting of an iron gate prevents it from rusting

Answer 1

Answer:

The paint on an iron gate makes a layer which prevents the iron from rusting . Except paint , sometimes a magnetic layer is also applied so it doesn't rust.

Explanation:

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Answer 2

The coat of paint prevent it from exposure to heat and moisture which are the main reasons for rusting.
Even the back side metal coating of a mirror is painted to avoid corrosion