Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
Iron wire will become red hot and glow. It will not produce a flame.
APPEARS IN
संबंधित प्रश्न
Make a labelled diagram of a candle flame.
Inner zone of flame : :______, outer zone of flame : :______
Magnesium ribbon on burning in air produces
The substance that does not burn with flame is ______.
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.
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 |
Write True/False against the following statement and also correct the false statement.
The substances which vapourise during burning, give flame.
Substances which vapourise during burning produce ______.
Match the following:
| 1. | Inner zone | a. | Yellow |
| 2. | Outer zone | b. | Borax powder |
| 3. | Middle zone | c. | Blue |
| 4. | Green flame | d. | Black |
