Which gas will relight a glowing splint ?

Question

                                                    Which gas will relight a glowing splint ?

 

(a). Oxygen

(b). Nitrogen

(c). Carbon Dioxide

(d). Helium

 

                                                 Why did you chose that ? (Simple Answer would help me more)

 

Thank you for sharing your knowledge! :l)

Answer 1

The gas that supports combustion is oxygen (O2), so the correct answer would be (a).  The reason for choosing that answer is that air has several gases, such as nitrogen (N2), Argon (Ar), carbon dioxide (CO2), etc.  But the only gas that is needed for and which supports combustion is oxygen.