You are provided with three watch glasses containing milk, petrol and mustard oil, respectively

cbse
cbse-class-8-science
combustion-flame

#1

You are provided with three watch glasses containing milk, petrol and mustard oil, respectively. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why?

Answer:
Petrol will catch fire instantly because it is highly inflammable. Mustard oil and milk has very high ignition temperature. So, they will not catch fire instantly.