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Three pieces of a rust free iron rod are completely coated with the following: (i) plastic (ii) oil paint (iii) zinc An identical scratch is made on each piece, thus exposing the iron. The pieces of iron are kept exposed to moist air for 10 days and then checked for rust formation.
A piece of iron rusts when it comes in contact with air and moisture. Prakash had two identical shiny iron pieces P and Q. To prevent the pieces from rusting, he coated piece P with oil paint and he galvanized piece Q with a coat of zinc metal. He noticed that the coatings were not complete and that a small part of the iron was exposed in both the pieces. What is Prakash likely to observe about the exposed parts of the two iron pieces after some days? Explain why.
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