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Q.

Which of the following is more challenging to burn some combustible substances than others?


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a

Less reactive

b

Highly reactive

c

Moderate

d

None of these 

answer is B.

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Detailed Solution

Highly reactive substances are more challenging to burn out rather than other combustible substances.
It is difficult to burn some combustible substances because they are highly reactive. They can easily catch fire, and in many cases, they can cause an explosion. Different combustible substances have different ignition temperatures. The ignition temperature is the lowest temperature at which a flammable substance begins to burn in the presence of air. Therefore, different substances have different ignition temperatures.
 
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