CHEMISTRY,  GENERAL KNOWLEDGE

HOW MANY ZONES ARE PRESENT IN A LUMINOUS BUNSEN BURNER FLAME

  • A. 2
  • B. 3
  • C. 4 ✓
  • D. 5
  • E. 6

 

The answer to the question is: C. 4

In a luminous Bunsen burner flame, there are four zones present. These zones are crucial to understanding the different regions within the flame and their characteristics.

  1. Inner Cone: This is the darkest part of the flame, located at the base of the flame. It is blue in color and is where combustion occurs with a lack of oxygen.
  2. Outer Cone: Surrounding the inner cone, the outer cone is brighter and yellow in color. This zone indicates incomplete combustion due to insufficient oxygen supply.
  3. Mantle: Above the outer cone lies the mantle, which is the brightest part of the flame. It appears yellow due to incandescence from hot carbon particles.
  4. Non-Luminous Zone: Beyond the mantle, there is a non-luminous zone where complete combustion occurs, resulting in a blue, nearly invisible flame.

 

In a non-luminous Bunsen burner flame, there are three zones present. These zones are crucial in understanding the different regions of the flame and their characteristics.

  1. Inner Cone: The innermost zone of a non-luminous Bunsen burner flame is the blue, hottest part known as the inner cone. This zone is where complete combustion occurs due to the optimal fuel-to-air ratio.
  2. Outer Cone: Surrounding the inner cone is the outer cone, which appears lighter in color compared to the inner cone. In this zone, partial combustion takes place as the fuel mixes with oxygen from the air.
  3. Mantle: The outermost zone of the non-luminous Bunsen burner flame is the mantle. This zone is characterized by a faint blue color and represents the area where combustion is incomplete, leading to the formation of soot particles.

Understanding these three zones is essential for controlling the combustion process in a Bunsen burner and achieving efficient heat generation without producing unwanted byproducts like soot.

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