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प्रश्न
You are provided with three watch glasses containing milk, petrol and mustard oil respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?
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उत्तर
The watch glass containing petrol will catch fire instantly because its ignition temperature is very low. Also, petrol is an inflammable substance, i.e. it can easily catch fire with a flame.
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संबंधित प्रश्न
Make a labelled diagram of a candle flame.
True or False – If False give the correct answer
All fuels form flame.
Inner zone of flame : :______, outer zone of flame : :______
Anu wants to boil water quickly in a test tube. On observing the different zones of the flame, she is not able to decide which zone of the flame will be best for boiling water quickly. Help her in this activity.
Match the following for the flame of a candle.
| Column A |
Column B |
Column C |
| (a) hottest part | (i) innermost zone of unburnt wax vapours | (x) blue |
| (b) moderately hot | (ii) middle zone of partial combustion | (y) black |
| (c) least hot | (iii) outer zone of complete combustion | (z) yellow |
If you hold a piece of iron wire with a pair of tongs inside a candle flame or a Bunsen burner flame, what will you observe? Will it produce a flame?
Match the following:
| 1. | White flame | a. | Table salt |
| 2. | Indigo flame | b. | Bleaching powder |
| 3. | Blue flame | c. | Potassium chloride |
| 4. | Orange flame | d. | Epsom salt |
Match the following:
| 1. | Inner zone | a. | Yellow |
| 2. | Outer zone | b. | Borax powder |
| 3. | Middle zone | c. | Blue |
| 4. | Green flame | d. | Black |
Write a note on flame.
Explain the structure of a candle flame.
