Question

2.
A yellow flame on a burner shows ....
combustion​

Answer 1

Answer:

Red/Yellow Flame Means Incomplete Combustion

A red, orange or yellow flame means incomplete combustion of the gas. Again, remembering back to high school, if you starved the Bunsen burner of air, the combustion process was incomplete and the gas flame colour burned sooty red or yellow and at a cooler temperature.