Question

question 10
which of the following produces the hottest flame?
a naturand oxygen
b propylene and oxygen
c propane and oxygen
d acetylene and oxygen
e oxygen

Explanation:

Acetylene (\(C_2H_2\)) and oxygen combustion is highly exothermic. The triple - bond in acetylene allows for a very complete and energetic reaction with oxygen. In oxy - acetylene torches, the flame temperature can reach around \(3300^{\circ}C\). Natural gas (mainly methane, \(CH_4\)) - oxygen flames are around \(2800^{\circ}C\), propane (\(C_3H_8\)) - oxygen flames are about \(2828^{\circ}C\), propylene (\(C_3H_6\)) - oxygen flames are around \(2990^{\circ}C\), and oxygen alone does not produce a flame (needs a fuel source).

Answer:

D. Acetylene and oxygen