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JEE Main · 2016 · 03 Apr 2016 · Offline · Chapter_pending

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The hottest region of Bunsen flame shown in the figure below is :
  1. (A)region 2✓ Correct
  2. (B)region 3
  3. (C)region 4
  4. (D)region 1

Answer: (A)

Solution

A Bunsen flame is hottest where combustion is complete and oxygen is plentiful, which is the outer non-luminous zone, region 2, reaching roughly C. Region 1 is unburnt gas, region 3 is the inner luminous cone of incomplete combustion, and region 4 is cooler, so the hottest part is region 2.

JEE Main · 2016 · 03 Apr 2016 · Offline · Single correct option

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