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Combustion And Flame

Question

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Why is the colour of outer zone of a candle flame is blue while middle zone is yellow coloured ?

Solution

Outermost Zone : It is blue coloured because complete combustion takes place in this part due to sufficient amount of oxygen. It is the hottest part of the flame.

Middle Zone : The colour of the middle zone is yellow because incomplete combustion takes place in this part with the lack of oxygen. It is less hot part than outer part of the flame.

Some More Questions From Combustion And Flame Chapter

Fire produced by oil cannot be controlled by ___________ .

Explain how the use of CNG in automobiles has reduced pollution in our cities.

Compare LPG and wood as fuels.

Give reasons :

Water is not used to control the fire involving electrical equipment.

Give reasons :

LPG is a better domestic fuel than wood.

Give reasons :

Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Make a labelled diagram of candle flame.

Name the unit in which the calorific value of a fuel is expressed.

Explain how CO₂ is able to control fires.

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

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