A person was sleeping in a closed room with coal burning in a container. Next day the person was found dead. Choose the reason(s) which could be responsible for his death.

Inadequate oxygen supply in body.

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Excess of oxygen supply in room.

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Excess of carbon monoxide in room.

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Excess of nitrogen dioxide in body.

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Solution

The correct options are
A Inadequate oxygen supply in body.
C Excess of carbon monoxide in room.
An incomplete combustion of coal produces a poisonous gas carbon monoxide. This gas combines with the haemoglobin to form carboxyhaemoglobin. The carboxyhaemoglobin reduces the oxygen carrying capacity of the blood. As a result the vital organs does not get oxygen to breathe and the person dies. Therefore, the possible reasons for the death of the person are inadequate oxygen supply and excess of carbon monoxide.

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