A flame is made up of three parts: the innermost part, the middle part and the outermost part. Why is the innermost part black?

Correct option is B

The correct answer is (B) Because of the presence of un-burnt carbon particles.

Explanation:
The innermost part of a flame appears black due to the presence of un-burnt carbon particles. These particles are formed when fuel undergoes incomplete combustion, meaning that it does not burn completely, leading to soot formation.

Information Booster:

• Un-burnt carbon particles (soot) are generated when there is insufficient oxygen during combustion.
• These particles absorb light, giving the innermost part of the flame its black appearance.
• The presence of soot is more common in yellow and smoky flames, typically seen in candles and oil lamps.

Additional Information:

• Complete combustion of fuel – Results in a blue or light-colored flame, not a black one.
• Incomplete combustion of fuel – Produces soot, but the primary reason for the black color is the presence of un-burnt carbon particles.
• Presence of oxygen – Oxygen is necessary for combustion, but it is not directly responsible for the black color of the flame.