Q:
      
      
         
            
If people sleep in closed rooms where charcoal fire is burning , they die due to 
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: A) carbon monoxide         
         
Explanation: A closed room is aplace where charcoal is burnt in limited supply of air. There is every chance for the formation of the deadly poisonous carbon monoxide, which when inhaled, reacts with the iron in haemoglobin of blood and prevents the supply of oxygen. It is said to be treacherous as there can be no previous warning of its presence because it is an odourless and colourless gas.
       
      
      
      
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