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Q.

The hottest region of the Bunsen flame shown in the figure below is-

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a

Region 2                                                                 

b

Region 3                                                                    

c

Region 4

d

Region 1 

answer is A.

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Detailed Solution

There are 4 main areas in the Bunsen Flame.
●        Region 1 (Pre-heating zone)
●        Region 2 (Primary Combustion Zone or Hottest Zone)
●        Region 3 (Inner Zone)
●        Region 4 (Secondary reaction area)
The hottest region of the Bansen flame is Region 2.
This hot region in the Bansen flame is mainly located above the top of the primary flame.
 
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The hottest region of the Bunsen flame shown in the figure below is-