Multiple choice

Why do substances like wax and kerosene oil burn while flaming flame?

  1. Wax and kerosene oil liquefied during burning and form flame

  2. Wax and kerosene oil vapourise during burning and produce flame.

  3. Flame is produced because kerosene oil and wax have low ignition temperature.

  4. Kerosene oil and wax are combustible substances and every combustible substance always produce flames on burning.
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B Correct answer
Explanation

Wax and kerosene oil burn with flames because they vaporize during combustion. When heated, these substances first melt (in case of wax) or form vapours (in case of kerosene), which then mix with oxygen and burn producing a flame. Flame is produced only when gaseous substances burn. Not all combustible substances produce flames - charcoal burns without a flame because it doesn't vaporize.

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