Question

When paper is wrapped around an aluminium pipe __________.
A) Ignition temperature reduces
B) Ignition temperature increase
C) No change in ignition temperature.
D) The paper and aluminium catches fire very easily

Answer 1

The answer is based on the fact about the concept of the combustion process that is when a paper is wrapped around aluminium pipe the paper will catch the fire a comparison of the wrapping a piece of paper and paper as a whole would lead you to the required answer.

Complete step by step answer:
In the previous classes of chemistry, we have studied the concepts relating to the combustion process and the reactions taking place when heat is supplied to the material and also the differences in the materials which conduct heat and the non conductors of heat.
Now we shall see what happens when paper is wrapped around the aluminium pipe.
- Combustion reaction is a chemical reaction in which a substance will react rapidly with oxygen and give off heat.
- Aluminium being a metal is a good conductor of heat and therefore the heat is conducted away if a piece of paper is wrapped around the aluminium pipe.
- Paper has lower ignition temperature when compared to that of aluminium.
- If a paper as whole is wrapped around the paper then the paper catches fire and the reason for this is that the ignition temperature increases in this case and thus the paper itself catches fire.
Therefore, based on all these above facts, we can say that the correct answer is option B) Ignition temperature increase. The correct option is option “B” .

Note: Note that metals are always the good conductor of heat and therefore when heat is supplied, it is absorbed by the aluminium and a piece of paper allows the heat conducted by aluminium to give away but the complete closure of the pipe with paper does not allow the heat to flow out and thus the paper catches fire due to increase in ignition temperature.