Discussion
On the basis of the following information identify the substances which give flame on burning :
| Substance | State | Vapourises on burning |
|---|---|---|
| A | Solid | No |
| B | Liquid | Yes |
| C | Solid | Yes |
| D | Liquid | No |
Answer: D
The substances that give a flame are B and C.
A flame is produced only by substances that vaporise during burning, because it is the burning vapour that forms the flame. Wax and kerosene, for example, burn with a flame, while charcoal only glows.
B and C vaporise on burning, whichever their state, so they give a flame. A and D do not vaporise, so they burn without a flame.
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