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Which of the following is NOT one of the three conditions necessary for combustion?
APresence of a supporter of combustion (e.g. oxygen)
BAttainment of the ignition temperature
CPresence of a combustible substance
DPresence of bright sunlight
Answer & Solution
Correct answer: D. Presence of bright sunlight
For burning, three conditions must be satisfied: a combustible substance, oxygen (a supporter of combustion), and a temperature at or above the ignition temperature. Sunlight is not required — fires burn at night and indoors equally well.
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