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The chemical name or formula of plastic or polythene is  (C2H4)nH2.
1 5 1
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The chemical formula of Plastic or Polythene is (C₂H₄)n
Polythene is nothing but poly ethylene. 
'n' in the above formula represents the chain of repeating units of ethylene in the polythene molecule.
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u could have also mentioned,plastics are chemically known as polymers
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