Question

give reason it is not advisable to sleep in a closed room with a coal fired fire place

Answer 1

Yes it's because when coal is burnt it emits lots of smoke which contains high amount of carbon monoxide . So when you sleep in a closed room with burning coal the air you inhale is carbon monoxide which is obviously not good for humans . After sitting in that room ( closed room) for some time you will start feeling dizzy may cause headache also , sleeping in that room is extremely dangerous as there are many cases where people sleeping in closed room with burning coal have died due to inhalation of carbon monoxide .Hence it is not advisable to sleep with burning coal in closed room

Answer 2

because coal emits CO carbon monoxide which when breath get mixed with heamoglobin and the person can even die