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Question

Some substances catch fire very easily like alcohol, petrol, LPG, etc. These are called inflammable substances but some do not catch fire easily like water. What could be the reason for it ?

A
Boiling point of inflammable substances is higher.
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B
Latent heat of vaporisation is lower for inflammable substances.
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C
Ignition temperature of inflammable substance is lower.
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D
Both (B) and (C)
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Solution

The correct option is D Ignition temperature of inflammable substance is lower.
The correct option is {c}.
Ignition temperature is the lowest temperature at which a substance catches fire. Ignition temperature is different for different substances. For example; LPG, petrol, natural gas, etc. catch fire at very low temperature and thus have low ignition temperature, while wood, coal, etc. have high ignition temperature.

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