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Plastics are made up of large polymers, containing strong bonds, so they are pretty unreactive.
   because they are :
           less reactive with acids.
           less reactive with bases
           less reactive with air.
           it does not get rusted with exposed to moisture.
           it does not react with chemicals
           it does not decompose or act with microbes.
           they doesnot react with metals and non metals.   
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