Question

Give reason:
a. If we put sand on a burning material, the fire extinguishes .
b. Hydrogen has the highest calorific value and it does not cause pollution. Then why do we not use it as a domestic fuel
c. Wood catches fire easily but water does not.

Answer 1

Answer:

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Explanation:

a) Sand can be used as a fire extinguisher especially foe burning of oil, electricity,(for fires that cannot be put down by water) because Sand is heavy and so when sand is thrown on fire it acts as a thick blanket for the fire which leads to less supply of oxygen .

b)Although hydrogen has the highest calorific value, it is not used as a domestic fuel. It is because hydrogen is a highly combustible and it reacts explosively when it comes in contact with air. And hence as a result, storing of the hydrogen gas is difficult and is dangerous at the same time.

c)Wood has low ignition temperature as compared to water.( Ignition temperature is the temperature at which substance catches fire.)