Question

Why do we feel suffocation in a closed room with some material burning

Answer 1

we feel suffocation while burning in a closed room because, the material burnt will release carbon monoxide and dioxide as it is closed room the gas can't escape and as we breath suffocated.
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Answer 2

We feel 'suffocated' in a 'closed room' that has some 'material' burning because the burning material releases gases like carbon dioxide and carbon monoxide.

EXPLANATION:

Since it is a closed room, these gases do not escape the room thereby causing problems in breathing.

Also in a 'closed room', the quantity of oxygen decreases as it is used for burning as well as breathing. The oxygen quantity in the closed room becomes less than that of carbon dioxide and carbon monoxide and so breathing problems are faced.