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Hydrocarbon,carbon-di-oxide and water vapour will be produced by burning polythene 
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Some dangerous gases
it is not a gas
The Brainliest Answer!
The problematic plastic is PVC - poly vinyl chloride, which releases HCl if it is burnt. 
Also remember that most plastics contain numerous additives - plasticizers, pigments, fillers, etc , which can release a wide variety of different gases .
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