Question

bunsen burner safety
which flame is hotter and forms when the air hole is open, used for heating?
non - luminous blue cone flame
luminous yellow flame
safety flame

Explanation:

When the air - hole of a Bunsen burner is open, complete combustion occurs, forming a non - luminous blue cone flame which is hotter and used for heating. A luminous yellow flame forms when the air - hole is closed and is cooler due to incomplete combustion. A safety flame is not the hottest and is mainly for safety purposes.

Answer:

Non - luminous blue cone flame