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प्रश्न
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 |
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उत्तर
| Column A |
Column B |
Column C |
| (a) hottest part | (iii) outer zone of complete combustion | (x) blue |
| (b) moderately hot | (ii) middle zone of partial combustion | (z) yellow |
| (c) least hot | (i) innermost zone of unburnt wax vapours | (y) black |
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संबंधित प्रश्न
Make a labelled diagram of a candle flame.
Inner zone of flame : :______, outer zone of flame : :______
Name the unit in which the calorific value of a fuel is expressed?
The ______ temperature at which a substance catches fire is called its ______ temperature.
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.
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?
Write True/False against the following statement and also correct the false statement.
Middle zone is the hottest zone of a flame.
Write True/False against the following statement and also correct the false statement.
The substances which vapourise during burning, give 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 |
Write a note on flame.
