Question

how can you say plastic are non corrosive in nature

Answer 1

As plastic comes in contact if air it doesn't get corroded or react to it so it is non corrosive in nature.While iron gets corroded easily..

Answer 2

plastics are non reactive in nature i.e., it don't react with any other substance (metal or non-metal) &
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we know that corrosion is caused by environmental gases and we also know that plastic is unreactive.....
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plastics CA sometimes be corroded by acids...