On a cold winter night, the persons slee...

On a cold winter night, the persons sleeping in a room with closed door and windows with a coal fire burning inside may die due to the excessive accumulation of :

nitrogen monoxide

nitrogen dioxide

carbon dioxide

carbon monoxide.

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The correct Answer is:

Incomplete burning of coal due to insufficient oxygen in closed room leads to formation of carbon monoxide which is poisonous and can cause death.

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