Question

Which of the following statements are true for different regions of flame?
L Yellow flames are ideal for heating.
11. The substances which vaporise during burning give flames.
III. Luminous zone contains unburnt carbon particles.
1. The non-luminous zone has highest temperature.
a) I, II and III
b) I, II and IV
c) II, III and IV
d) I, III and IV
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Answer 1

Explanation:

HEY MATE HERE IS YOUR ANSWER

1. . A wavering, yellow flame on a normal gas burner indicates that the burner is out of adjustment or the air inlet is restricted. As a result, the burner may be producing excessive amounts of CO. However, the flames in burners that use fuel oil should burn with a clear yellow or orange flame . This is an indication of good combustion in equipment that burns fuel oil.
2. Substances which vaporize during burning gives flame. For example, combustion of kerosene oil produces a flame. On the other hand, certain substances like coal do not vaporize and hence does not produce a flame.
3. The circular dark ring is formed on the slide is due to the deposition of unburnt carbon particles present (middle) in the luminous zone of the candle.
4. Here there are three zones. They are: A is non-luminous zone, B: Luminous zone and C: Dark Zone. Non-luminous zone is the zone of complete combustion. It is the hottest zone of the candle flame and does not produce much light. Middle zone is the zone which is moderately hot with limited supply of oxygen. C is dark zone as this zone doesn't support burning. Because there is no supply of air.