Question

An iron article should be given a coat of paint give scientificreason

Answer 1

this is due to protect it from rusting

Answer 2

An iron particle must be coated with paint so as to prevent it from the process "rusting".
Rust is another name for iron oxide, which occurs when iron or an alloy that contains iron.....
 Iron articles are painted to prevent them from rusting. After painting iron surface does not come in contact with moisture and air which cause rusting.