Question

Give reasons
a) Kerosene is commonly used to start fire in wood.
b) LPG is a better domestic fuel.
c) It is not safe to sleep in a room with burning coal fire in it.

Answer 1

a)....The ignition temperature of paper and kerosene oil is low in comparision to wood or coal.Therefore, a burning paper or keroseneon wood is used to start fire in wood and coal.The paper and kerosene oil catch firefirst.This fire cause wood and coal to attain their ignition temperature so that they also catch fire.



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b)..
     (b) LPG is better domestic fuel than wood because it neither produce gases nor leaves residues that pollute the environment.


c).....
In the presence of less amount of oxygen the carbon monooxide gas produced by incomplete combustion of coal. It is a poisonous gas and can kill the person sleeping in a closed room.
 

Answer 2

(b) LPG is better domestic fuel than wood because it neither produce gases nor leaves residues that pollute the environment.


(a).Because ignition temperature of wood or coal is higher then that of the paper or kerosene oil.

So, when we burn kerosene or paper it provide sufficent heat till it reach ignition temperature and burn wood or coal.




(c). Burning of coal in the absence of sufficient oxygen generates carbon monoxide which is a toxic gas. Sleeping in carbon monoxide can lead to serious health issues including death.