Question

which property of plastic makes them so useful but also makes them environmental hazard

Answer 1

Plastics are non-reactive and hence they are useful in storing chemicals and their property of non-reactive makes them
non-biodegradable in nature.
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Answer 2

Answer:

The non-reactive property of plastics makes them useful and also a hazard for the environment.

Explanation:

Plastic being non-reactive can be used to store chemicals easily. On the other hand, because plastic is non-reactive, it cannot degrade and decompose very easily. Plastic on burning produces a lot of smoke that contains many harmful gases.

Plastic is also non-biodegradable by nature and plastic debris causes aesthetic, environmental as well as several health hazards.