Advertisements
Advertisements
प्रश्न
The substances which vaporise during ______ give flame.
Advertisements
उत्तर
The substances which vaporise during burning give flame.
APPEARS IN
संबंधित प्रश्न
Make a labelled diagram of a candle flame.
Name the unit in which the calorific value of a fuel is expressed?
The substances which gave very ______ ignition temperature and can easily catch fire with a flame are called ______ substances.
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?
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?
Which is the luminous part of the 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 |
Name a few substances which produce flames on burning.
