Question

When water is poured over burning wood, the fire goes off. This is because ………
A. temperature of wood decreases
B. temperature of water goes up
C. molecules of water reacts with oxygen present in the flame
D. the flame vaporizes

Answer 1

Hint: Combustion is a chemical process or we can say it is a reaction between fuel and oxygen. Where we know that fuels of many types like CNG, LPG, wood etc are known as fuels. Wood is known as the primary source of fuel.

Complete answer:
In common houses or we can say in villages wood is used as a fuel for cooking food or many other things. Burning of wood is known as the combustion process. When fuel and oxygen react with each other then it produces heat and light. Heat and light energy then combine in the form of flame.
To burn wood we first have to know about the ignition temperature which can be defined as that temperature where a substance starts burning lower than its ignition temperature a substance will not catch fire. The ignition temperature for wood is very high as compared to other fuels like CNG, LPG etc.
When water is poured over burning wood the fire goes off. This can be explained that water absorbs a large amount of heat energy due to which it falls in the temperature of wood below its ignition temperature and the fire goes off.

Hence option A is the correct answer.

Note:
Combustion is basically said to be exothermic in nature where exothermic reactions are those reactions in which heat is evolved as in combustion heat and light is produced, flame is also one of the types of combustion.